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This study examined the functional morphology of the trace fossil Paleodictyon in terms of computational fluid dynamics. The modern specimens show a unique morphology that is composed of a hexagonal mesh structure, vertical shafts opening to the seafloor, and a shield-like mound on the seafloor. The traces of the vertical shafts were also preserved in some fossil examples. To explain their characteristic morphology, a “passive ventilation” hypothesis has been proposed suggesting that their function was to ventilate their burrows with bottom currents, which supply both oxygenated water and food. However, this hypothesis has not yet been verified. This study conducted numerical experiments to understand the functions of the structures created by this ichnofossil by using a model of computational fluid dynamics with the 3D geometry of Paleodictyon and estimating the efficiency of the ventilation in burrows. As a result, it was observed that seawater flowed in the vertical shafts in the marginal area of the mound, and flowed out from the shafts located on the top of the mound, flowing through the mesh structure. This ventilation was observed only in the case that Paleodictyon had a shield-like mound. The ventilation rate rapidly increased as the bottom current velocity increased. In contrast, the rate also increased with the height of the shield-like mounds, whereas it once dropped after the minor peak at 4 mm in height, which corresponds to the value measured in the modern specimens. This coincidence may imply that the height of the mound observed in modern specimens resulted from the optimization in balancing between the efficiency of ventilation and physical stability against erosion. Full exchange of water in the mesh structure by ventilation took less than a few minutes at this mound height, which is presumably sufficient for the ability of Paleodictyon producers.

The trace fossil Paleodictyon is characterized by a regular hexagonal network and has been widely considered to be a characteristic of the Nereites ichnofacies, indicative of a deep-marine environment. Recently, however, some researchers have reported Paleodictyon occurrences in relatively shallow settings, leading to suggestions that the habitat of these burrowers was not restricted to deep-marine environments. A new occurrence of this trace fossil is presented in this study from a shallow-marine succession of Upper Cretaceous deposits in northern Japan. Paleobathymetric and temporal variations in the habitat range of shallow-marine examples of this ichnotaxon are also discussed based on a compilation of previous works. The new Paleodictyon specimens discussed here are from the lowermost part of the Mikasa Formation within the Yezo Group, interpreted as a deposit representing the lower shoreface through to the inner shelf transitional zone. This paper presents the first record of a shallow-marine Paleodictyon from the Pacific region; combined with data from previous studies, records suggest that shallow-marine Paleodictyon are observable from Paleozoic-to-Mesozoic shelf deposits, although no reliable records of their occurrences have so far been reported from the Cenozoic. Increasing bioturbation intensity and predation pressure during the Mesozoic and Cenozoic may have been significant factors preventing the preservation of this ichnogenus in post-Mesozoic shallow-marine settings. The Paleodictyon-bearing interval of the Mikasa Formation also preserves evidence for low-intensity bioturbation, which may account for preservation of the traces in this case.

Histological changes in the collecting lymphatics in patients with lymphedema are classified as Normal type, Ectasis type, Contraction type, and Sclerosis type (NECST) classification. In this study, we investigated the condition of the lymphatic vessels in different sites of the legs.We prospectively investigated the lymphatic vessels of patients with lymphedema who underwent lymphaticovenous anastomosis (LVA) from August 8, 2014 to August 4, 2015 based on the NECST classification. Lymphedema was diagnosed using lymphoscintigraphy, indocyanine green (ICG) lymphography, and the International Society of Lymphology (ISL) Classification. The affected limbs were divided into four sites: proximal thigh (Site 1), distal thigh (Site 2), proximal crus (Site 3), and distal crus (Site 4).A total of 109 patients (205 limbs and 1028 lymphatics) were included in this study. Of the 109 patients, there were 100 women and 9 men with an average age of 61 years. The ratio of Ectasis type vessels increased toward the distal end of the limb with the highest occurrence rate being 54% at Site 4. As ISL stage, ICG stage, and lymphoscintigraphy stage advanced, so too did the ratio of Sclerosis type. In secondary lymphedema patients with lymphedema, the ratio of Ectasis type was more predominant in the distal end of the limb, whereas this tendency was not observed in primary lymphedema patients.Sclerotic lymphatics are more predominantly found in the proximal limb whereas nonsclerotic vessels are more often found toward the distal end. These findings help lymphatic surgeon determine incision sites.

We propose a new method to evaluate the diversity of ichnofossils from outcrop. Ichnodiversity (defined here as the number of ichnotaxa) characterizes paleoenvironmental conditions. However, the apparent numbers of ichnotaxa observed in outcrops are significantly affected by differences in areas of exposed outcrops. This study proposes a new method to evaluate ichnodiversity, independent of outcrop exposure bias, by using an image-resampling technique combined with the shareholder quorum subsampling method. In this method, the relationship between observed and detected numbers of ichnotaxa is estimated by subsampling from existing outcrop images. The relative diversity of ichnotaxa is obtained at a given value of the estimated coverage parameter, representing the ratio of the observed number of ichnotaxa to the actual diversity. The method was verified by analyzing artificial images of ichnoassemblages, and the method successfully estimated reasonable values of relative diversity of ichnotaxa. It was also suggested that the spatial distribution patterns of ichnofossils on the bedding planes does not affect the estimated intensity of ichnodiversity when using this method. This method was also applied to field data pertaining to deposits of the submarine channel-levee complex in the Oligocene Izaki Olistolith of the Nichinan Group, southwest Japan. As a result, the ichnodiversity of the successions in the Izaki Olistolith was reconstructed to be relatively high in channel deposits and low in levee deposits.

Background One of the complications of lymphoedema is recurrent cellulitis. The aim was to determine whether lymphaticovenous anastomosis (LVA) was effective at reducing cellulitis in patients with lymphoedema. Methods This was a retrospective review of patients with arm/leg lymphoedema who underwent LVA. The frequency of cellulitis was compared before and after surgery. The diagnostic criteria for cellulitis were a fever of 38·5°C or higher, and warmth/redness in the affected limb(s). Results A total of 95 patients were included. The mean number of episodes of cellulitis in the year preceding surgery was 1·46, compared with 0·18 in the year after surgery (P < 0·001). Conclusion LVA reduced the rate of cellulitis in these patients with lymphoedema.

Dorsal skin defect of the hand/digit requires thin and pliable skin for coverage. The prepuce skin, the second thinnest skin, can be a reconstructive option, but there is no previous report of a free prepuce flap for the reconstruction of the hand/digit. We report the first successful case of a free prepuce flap based on the superficial penile artery perforator (SPAP) for the treatment of dorsal soft tissue defect of the hand/digit. A 68-year-old male presented with a 5 x 3 cm dorsal soft tissue defect of the left index finger with the extensor tendon exposure. A prepuce perforator flap was raised based on the SPAP. The flap was transferred to the recipient site, and the SPAP was supermicrosurgically anastomosed to the dorsal branch of the digital artery. The patient complained no postoperative discomfort of the donor penis, and was satisfied with functionally pleasing and esthetically acceptable results of the reconstructed finger and the donor site. Although only applicable for male patients without past history of penile trauma such as circumcision, a prepuce perforator flap may be an option for thin and pliable skin reconstruction with minimal donor site morbidity. © 2016 Wiley Periodicals, Inc. Microsurgery 37:252-255, 2017.

Schaubcylindrichnus coronus is a common trace fossil occurring in post-Cretaceous shallow marine deposits. It consists of a sheaf or bundle of thickly lined tubes, with the tube linings usually composed of colorless minerals (“mineral-lined” type). Recently, many peculiar specimens of S. coronus, whose tube linings are composed mainly of tests of the larger benthic foraminifer Operculina complanata japonica (“Operculina-lined” type), have been found in the inner shelf deposits of the late Miocene Kaichigo Formation in the Miyazaki Group, southwestern Japan. The “Operculina-lined” specimens occur in association with funnel-shaped concentrations of Operculina tests. In some specimens, the end of the tube directly connects to the concentration. We consider these concentrations to be the product of feeding funnels filled with Operculina tests that were delivered from shallower marine settings in association with storm currents. Considering the fact that no Operculina tests are found in the host rocks that bear Operculina-lined tubes, the Operculina tests that line the tubes appear to have originated from Operculina test concentrations. In other words, during feeding, the animal producing S. coronus apparently selected the tests in its feeding funnel by their specific gravity and utilized them for tube construction. This manner of tube construction is highly consistent with that of modern funnel-feeding polychaete worms.

Background Collecting lymphatics have lymph-drainage function with contraction of smooth muscle cells. Patients with edema have lost this drainage function due to degeneration of smooth muscle cells. Lymphaticovenular (LV) anastomosis salvages smooth muscle cells from reversible degeneration (mild edema), but muscle cells cannot be recovered from irreversible degeneration (severe edema). Therefore, in severe edema, LV anastomoses cannot reestablish the drainage function of the lymphatic system. To overcome this weakness of LV bypass methods for severe edema, new methods were instituted for repair of this missing drainage function using a lymphadiposal flap from the contralateral foot for hemilateral edema, or transfer of lateral thoracic lymph nodes for bilateral edema. Methods A total of 13 cases were repaired with lymphadiposal flaps and additional LV anastomoses. These cases have frequent phlegmon or cellulitis or resisted to previous LV anastomoses and/or compression therapy. The ages ranged from 15 to 75 years. There were four cases of primary edema and nine cases of secondary edema. Results Regarding the lymphadiposal flap (n = 8), three cases showed an excellent response (37.5%; no need for compression therapy), four cases had a good response (50%; improvement with compression), one case showed no change (12.5%; no improvement), and there were no cases of deterioration. Regarding the lateral thoracic lymph nodes transfer (n = 5), two cases had a good response (40%), three showed no improvement (60%), and there were no cases of deterioration. Conclusion It is concluded that lymphadiposal flap or lymph nodes transfer is suitable for severe edema having frequent cellulitis in unilateral or bilateral lower extremities resisting previous LV anastomoses and/or compression therapy.

Lymph transportation capacity is a critical function maintaining fluid circulation. After breast cancer treatments, lymph obstruction at the axilla leads to abnormal lymph circulation, resulting in lymph pump dysfunction. As well as lymph circulation, lymph pump function is important for lymphedema evaluation.We assessed and analyzed lymph transportation capacity of 15 breast cancer-related arm lymphedema patients using dynamic indocyanine green (ICG) lymphography.ICG velocity and transit time could evaluate lymph pump function; ICG velocity decreases and transit time increases as the lymphedema severity stage progresses. Measurement of ICG velocity required 3 minutes after the dye injection, whereas that of transit time took more than 1 hour in severe cases.ICG velocity can be easily obtained and is recommended for evaluation of lymph pump function. Dynamic ICG lymphography, which evaluates both lymph pump function and circulation, plays an important role in comprehensive assessment of lymphedema pathophysiology.

Supermicrosurgical lymphaticovenular anastomosis (LVA) is becoming a treatment option for progressive lymphedema. Various types of LVA such as end-to-end, end-to-side, side-to-end, and side-to-side are performed to improve the treatment efficacy.We applied sequential anastomosis for LVA surgery, in which 2 lymphatic vessels were anastomosed to 1 venule using side-to-side and side-to-end anastomoses. Six lower extremity lymphedema (LEL) patients who underwent sequential anastomosis were included in this study. Feasibility, anastomosis patency, and treatment effect of the method were evaluated.Six sequential anastomoses were performed on 6 lymphedematous limbs. All sequential anastomoses showed good anastomosis patency after completion of anastomoses. A significant decrease in LEL index was seen postoperatively (244.0 ± 14.6; postoperative LEL index vs 263.5 ± 19.4; preoperative LEL index, P = 0.002).Sequential anastomosis can divert both normograde and retrograde lymph flows from 2 lymphatic vessels into 1 venule. Sequential LVA is a useful method to increase lymph flow bypasses, when there are fewer venules than lymphatic vessels.

Lymphatic supermicrosurgery, supermicrosurgical lymphaticovenular anastomosis (LVA), is becoming a useful option for the treatment of compression-refractory lymphedema. One of the most important points in LVA is to make as many bypasses as possible for better treatment results. We report a progressive lower extremity lymphedema (LEL) case successfully treated with a ladder-shaped LVA. A 67-year-old female with secondary LEL refractory to conservative treatments underwent LVA. A ladder-shaped LVA was performed at the left ankle. In the ladder-shaped LVA, 3 lymphatic vessels and 1 vein were anastomosed in a side-to-side fashion; 2 lymphatic vessels next to the vein were anastomosed to the vein, and the other lymphatic vessel was anastomosed to the nearby lymphatic vessel. Using ladder-shaped LVA, 6 lymph flows of 3 lymphatic vessels could be bypassed into a vein. Six months after the LVA operation, her left LEL index decreased from 212 to 195, indicating edematous volume reduction. Ladder-shaped LVA may be a useful option when there are 3 lymphatic vessels and 1 vein in a surgical field.

The use of the intercostal artery perforator (ICAP) flap has recently become popular in reconstructions of the breast, upper arm and trunk. Lateral cutaneous branches (LCBs) are a group of the ICAPs that penetrate the fascia near the middle axillary line. However, reports on its precise anatomy and clinical applications are quite limited. We performed an anatomical study of LCBs using cadavers. Based on the findings, we developed novel clinical application methods as follows: (1) sensate superficial circumflex iliac perforator (SCIP) flap, (2) supercharged SCIP flap, (3) ICAP-based propeller flap (IBPF) and (4) free ICAP flap based on LCB. LCBs have the following advantages: (1) Long pedicles can be obtained in the supine position without risk of pneumothorax. (2) The neurovascular bundle is consistently available, allowing elevation of sensate flaps. (3) Donor-site morbidity is low. Therefore, we believe that LCBs offer a versatile option in reconstructive surgery.

Several surgical methods for creating an external auditory canal have been developed in step with clinical innovation. However, revision surgery is often required to address complications, which include external auditory canal stenosis, lateralization of the tympanic membrane, and chronic recurrent otorrhea. These complications occur frequently within 6 to 12 months after surgery. To decrease the incidence of complications, the authors reconstruct the external auditory canal and tympanic membrane in patients with congenital aural atresia using a free pure skin perforator flap that is as thin as a skin graft. They report their outcomes for hearing acuity and complications over 12 months after the operation.The authors performed reconstruction of the external auditory canal and tympanic membrane in nine patients with congenital aural atresia. The flap design was based on a pure skin perforator derived from the groin area in eight patients. The flap was folded into an approximately 1.5×3-cm sac and inserted into the external auditory canal. Anastomosis was performed between the perforator vessels and superficial temporal vessels.All pure skin perforator flaps survived, although one case had partial epidermal necrosis. The audiologic follow-up period ranged from 12 to 24 months (mean, 17 months). The mean pure-tone average was 65.1 dB (range, 53 to 80 dB) preoperatively and improved to 32.4 dB (range, 8 to 53 dB) postoperatively. None of these cases showed any potential complications.This flap may therefore reduce complications and help to maintain hearing acuity in the long term.Therapeutic, IV.

Summary Background The method of lymphatic venous anastomosis (LVA), including its indications or preoperative examinations, has not been established. The purpose of this study is to reveal the possible application of preoperative echography in surgical LVA outcome. Methods We performed a retrospective case-control study on patients with lower limb lymphedema who underwent LVA between August 15, 2013 and August 15, 2014. As a preoperative examination, we used venous echography to identify subcutaneous veins in the echo group, while we only used Accuvein visualizing system in the control group. The operation time, number of anastomoses, and limb circumference were compared between the two groups. Results Seventeen patients (34 limbs) were included in the echo group, and 21 patients (42 limbs) were included in the control group. The average follow-up period was 11.9 (6–16) and 12.4 (6–27) months, respectively. The average operation time in the echo group was 258.6 min, and that in the control group was 216.5 min. The average number of anastomoses was 9.8 and 7.0 in the echo and control group, respectively. The average time per anastomosis was 27.4 and 32.6 min, respectively. The diameter of the vein had a tendency to be larger in the echo group than in the control group. In 5.8% of the echo group, we observed a circumference increase, compared with 23.8% in the control group. Conclusions Preoperative venous echography allowed surgeons to increase the number of anastomoses performed within the operating time, resulting in improvement of surgical outcomes.

Background: We investigate the effectiveness of lymphaticovenous anastomosis (LVA) in releasing lymphedema-associated pain. Methods: We performed a retrospective analysis. Subjects of this study included lower extremity lymphedema patients who presented persistent and constant degrees of pain in their lower limbs. LVA was performed under local anesthesia. The preoperative lower extremity pain and postoperative lower extremity pain were surveyed using the visual analog scale on a score from 0 to 10. The circumferences of the limbs were also recorded. Results: A total of 8 patients (16 lower limbs) were included. The subjects included 1 man and 7 women, and their average age was 72 years. The average follow-up period was 17 months. The average preoperative and postoperative visual analog scale scores were 5.3 and 1.8, respectively. Moreover, 7 patients who had records of their lower extremity circumference observed an average changing rate of −4.7% in lower extremity lymphedema index after the surgery. Conclusion: LVA can release the pain in the affected limbs of lymphedema.

Objective Pelvic lymphocele can be a severe complication associated with surgical procedures such as pelvic lymphadenectomy. Lymphaticovenular anastomosis (LVA) is increasing in popularity as a surgical treatment for lymphedema. The aim of this study was to evaluate whether LVA is an effective treatment for lymphocele, which is caused by an obstruction of the lymphatic flow in a manner similar to the development of lymphedema. Methods Eleven female patients, who presented with lymphocele, were treated with LVA. Before the operation, 3 of them were treated with a percutaneous catheter. Lymphocele size and the volume of daily drainage were measured before and after LVA. Results The lymphocele was completely resolved in 6 patients and partially resolved in the remaining 5 patients. The mean size of the pelvic lymphocele changed from 400 ml (range 50-1050 ml) to 43 ml (range 0-120 ml) (P < 0.01). In the 3 patients who had percutaneous drainage catheters, the volume of fluid drained decreased from 340 ml/day to 20 ml/day after LVA. Conclusions Our technique is minimally invasive and is performed under local anesthesia. LVA is effective regardless of the size of the lymphocele. Therefore, LVA should be considered as a therapy for lymphocele because of its low invasiveness and its effectiveness in re-establishing circulation of lymphatic flow. Further studies should be performed to compare LVA with other minimally invasive techniques, such as percutaneous catheter and sclerotherapy. © 2012 Elsevier Inc. All rights reserved.

Remarkable progress has been made in microsurgery. However, fingertip replantation following amputation has not gained much popularity because of its technical difficulty. We have developed the intravascular stenting (IVaS) method, in which a nylon monofilament is placed inside the vessel lumen to act as a temporary stent, facilitating anastomosis completion. This report describes 7 fingertip replantations using the IVaS method. Intravascular stent size varied from 4-0 to 6-0 (0.199-0.07 mm diameter). There were no cases in which the back wall of a vessel became inadvertently caught in the anastomosis. The overall survival rate for distal digital replants was 85% (6/7 replants). It is very difficult to evenly anastomose vessels of differing diameter, especially on a supermicrosurgical scale. In this respect, the IVaS method plays a role in stably anchoring the 2 vessel ends, allowing for the even spacing of suture knots, even in vessels of different caliber. Because of its ease of use and exactitude, many surgeons may be able to use the IVaS method to reliably complete small anastomoses in fingertip replantations.

For hand and finger reconstruction, thin and flexible skin coverage is ideally required. A free flap is one of the surgical options used for large defects. However, a flap containing the fat layer is bulky. Several debulking surgeries are often needed for aesthetic and functional purposes. To overcome this disadvantage, we herein report our experience of six cases of hand and finger reconstruction using a pure skin perforator (PSP) flap concept. A PSP flap is a thin skin flap that is vascularized by a perforator branch penetrating the dermis. The thickness of the PSP flap could be approximately ≤2 mm as needed. The superficial circumflex iliac artery and superficial inferior epigastric artery were used as a flap pedicle. Secondary defatting operations were not required. For the success of PSP flap elevation, we applied three techniques: the microdissection technique for vessel separation, thin flap elevation at the superficial fascial layer, and the temporary clamping method. Temporary clamping was applied for the main trunk of pedicle vessels during debulking to prevent unwanted bleeding, which allowed us to freely perform three-dimensional defatting. Using these three techniques, the PSP flap can be elevated and adjusted for complex contouring of the hand and finger. Although the use of the PSP flap requires further study, the PSP flap is an effective, superthin flap with the advantages of both skin graft and perforator flaps.

Toetip flap transfer is a useful reconstructive method for fingertip defect, but elevation of a toetip flap is technically demanding because of difficulty to dissect a pedicle vein of the flap. Recently, nonenhanced angiography (NEA) has been reported to be useful for preoperative visualization of the digital vessels without contrast enhancement or invasiveness. We report a case in which preoperative NEA visualized a vein suitable for a venous pedicle of a second toetip flap and facilitated successful toetip flap transfer for reconstruction of a fingertip defect. A 27-year-old male suffered from the right middle fingertip crush amputation in Tamai zone 1. The fingertip was reconstructed using a second toetip flap with preoperative NEA guidance. A pedicle vein was easily found and dissected exactly where NEA visualized. Nine months after the toetip flap transfer, the reconstructed right middle finger was functionally and aesthetically pleasing, and the toe nail at the donor site was preserved without any morbidity. NEA may help a surgeon to find drainage veins for a toetip flap, which leads to easier and more secure toetip flap transfer.

Ferromagnetic magnetite (Fe3O4) thin films for magnetoelectric multiferroic applications were deposited on (200) (Bi3.25Nd0.65Eu0.10)Ti3O12 (BNEuT)/(101) Nb:TiO2 substrates by metalorganic chemical vapor deposition (MOCVD) using an iron(III) tris(2,2,6,6-tetramethyl-3,5-heptanedionato) precursor as the iron source. The BNEuT film utilized as a ferroelectric template material was in the form of freestanding nanoplates with narrow spaces between them. The effects of deposition conditions such as the deposition time and substrate temperature on the magnetic and structural characteristics of the Fe3O4/BNEuT composite films were investigated. All the films consisted of mostly single-phase Fe3O4 with a cubic inverse-spinel structure. When deposition was carried out at temperatures of 400–420 °C, the filling rates of particles introduced into the narrow spaces between the BNEuT nanoplates exhibited high values of 76–89% including the amorphous phase. This suggested that the deposition in this temperature range made progress according to the growth mechanism of MOCVD in the surface reaction rate determining state. Room-temperature magnetic moment–magnetic field curves for Fe3O4 thin films deposited at 400–500 °C for 60 min exhibited narrow rectangular hysteresis loops, indicating typical soft magnetic characteristics.

Objective: Ectopic implantation was first reported by Godina in 1986. We herein present 2 cases in which amputated fingers were salvaged and reconstructed by means of temporary ectopic implantation utilizing perforator anastomoses and chimeric flaps. Methods: Case 1. A 30-year-old man injured his right hand. All of the fingers were completely crushed with the exception of the little finger. We performed an ectopic implantation by using the superficial circumflex iliac artery perforator. Three months later, the little finger was transplanted with the superficial circumflex iliac artery perforator flap, vascularized nerve, and the 2nd metacarpal bone. Case 2. A 29-year-old man suffered a degloving injury of the index finger. The digital artery was anastomosed to deep inferior epigastric artery perforator. One month later, a deep inferior epigastric artery perforator flap containing the ectopically transplanted index finger was transplanted, but the index fingertip became pale and necrotized. After debridement, a hemipulp transplantation was performed. Results/Conclusions: As the diameter of perforators is similar to that of digital arteries, and perforators are capable of supplying large areas of tissue, they can be used as recipient vessels for ectopic implantation in finger salvage procedures. Another advantage of perforators as feeding vessels in ectopic implantation is the possibility of forming an ectopic chimera; the finger can be incorporated as a part of the chimeric reconstructive flap. With respect to these advantages, the perforator can be used as a feeder in an ectopic implantation of single finger.

Summary Background Lymphoedema can be treated conservatively or surgically. Early treatment is important, but the surgical indication and the effect of surgery on pain in lymphoedema-affected limbs have not been described. The objective of this study was to examine the effect of low-invasive scarless lymphatic venous anastomosis (LVA) for early or latent lymphoedema. Methods LVA was performed in six patients (eight legs) with leg lymphoedema between April 2010 and March 2011. Lymphoedema was stage 0 (defined as subclinical) in three patients (five legs) and stage 1 in three patients (three legs). Subjective symptoms, circumference of the affected leg and a lymphoscintigram were evaluated before and 6 months after surgery. Preoperatively, subcutaneous lymph vessels and veins were identified non-invasively using ICG lymphoscintigraphy and non-invasive instruments for visualising subcutaneous vein, AccuVein system, through the skin. These vessels and veins were secured with vessel loops passed underneath and side-to-side anastomosed under a surgical microscope. Results Subjective symptoms improved after surgery in all patients. The leg circumference improved in stage 1 cases, which all had an increased circumference before surgery. Lymph retention was observed on preoperative lymphoscintigraphy in all six patients and was improved after surgery in all cases. Conclusions Scarless LVA performed through a small incision improves abnormal lymph circulation and subjective symptoms in cases of early lymphoedema, in which the limb circumference has just started to increase, and latent lymphoedema, in which the circumference has not increased, but abnormal findings on lymphoscintigraphy or subjective symptoms are present.

Lymphaticovenular anastomosis has become an increasingly common treatment for lymphedema. Supermicrosurgical techniques are essential for the successful performance of lymphaticovenular anastomosis. A positive correlation between the number of lymphaticovenular anastomoses performed and therapeutic efficacy has been reported, and in performing these anastomoses, the establishment of as many bypasses as possible is important.Forty limbs of 20 patients with lower extremity lymphedema who underwent lymphaticovenular anastomosis in our department were assessed. All cases were performed under local anesthesia using two to four surgical microscopes. A new method of anastomosis, lambda-shaped anastomosis assisted by intravascular stenting, was chosen in required cases.Lymphaticovenular anastomoses resulted in 186 anastomoses on 20 patients with lower extremity lymphedema; the average number of anastomoses per case was 9.3 (range, five to 18). The number of surgical microscopes used ranged from two to four (average, 3.3), and the duration of the operation ranged from 3 to 5 hours (average, 4.1). In the cases of lambda-shaped anastomosis (n = 11), the number of anastomoses was significantly greater than in the cases without lambda-shaped anastomosis (n = 9; 10.2 ± 2.3 versus 8.2 ± 1.4; p0.05).Lambda-shaped anastomosis assisted by intravascular stenting is a safe and relatively easy method that can be performed by surgeons with less than 1 year of experience in microsurgery. This in turn allows efficient lymphaticovenular anastomoses to be performed simultaneously by a team of surgeons, resulting in an increased number of bypasses.

Summary Microtia or pinna deformities with congenital aural atresia are severe conditions that significantly affect the quality of life. Although several surgical treatments have been proposed for aural atresia, revision surgery is often required to address complications associated with the initial procedure, which include external auditory canal stenosis, lateralization of the tympanic membrane and chronic recurrent otorrhea. However, such problems may be addressed by using vascularized skin. We herein report a new method of reconstruction for congenital aural atresia in three cases using the superficial circumflex iliac artery as a pure skin perforator flap. Materials & methods The branch of the superficial circumflex iliac artery perforator was traced distally to a point where it penetrated the dermis. After identifying the branch of the perforator penetrating the dermis (termed the "pure skin perforator"), the pure skin perforator flap was elevated. A new external auditory canal was then created by drilling through the mastoid air cells and atresia plate. The pure skin perforator flap was folded into a 1.5 × 3 cm sac, which was placed into the external auditory canal. The superficial circumflex iliac artery and the superficial circumflex iliac vein were anastomosed to the superficial temporal artery and the superficial temporal vein, respectively. Results All of the pure skin perforator flaps survived. The flap sizes varied from 10 × 2.5 to 10 × 4 cm (average area of 32.5 cm 2 ). These skin perforator flaps were all 2 mm thick. Conclusion Pure skin perforator flaps fed only by the dermal subpapillary plexus survived, regardless of the presence of the subdermal plexus. The pure skin perforator flap can be as thin as a skin graft and it has the possibility to reduce the complications that frequently occur when the previously reported procedures are used.

In this experiment, we evaluated the effects of strong static magnetic fields (SMF) on the orientation of myotubes formed from a mouse-derived myoblast cell line, C2C12. Myogenic differentiation of C2C12 cells was conducted under exposure to SMF at a magnetic flux density of 0-10 T and a magnetic gradient of 0-41.7 T/m. Exposure to SMF at 10 T led to significant formation of oriented myotubes. Under the high magnetic field gradient and a high value of the product of the magnetic flux density and magnetic field gradient, myotube orientation increased as the myogenic differentiation period increased. At the 3 T exposure position, where there was a moderate magnetic flux density and moderate magnetic field gradient, myotube orientation was not observed. We demonstrated that SMF induced the formation of oriented myotubes depending on the magnetic flux density, and that a high magnetic field gradient and a high value of the product of the magnetic flux density and magnetic field gradient induced the formation of oriented myotubes 6 days after myogenic differentiation. We did not detect any effect of the static magnetic fields on myogenic differentiation or cell number. To the best of our knowledge, this is the first report to demonstrate that myotubes orient to each other under a SMF without affecting the cell number and myogenic differentiation.

The aim of this study is to evaluate the effects of intermediate frequency (IF) fields generated by induction heating (IH) cooktops from the perspective of cellular genotoxicity and stress responses.We evaluated the effects of exposure to 23 kHz magnetic fields at 6.05 mT(rms) for 2 h on cellular genotoxicity and stress responses in vitro. The maximum output power in most IH cooktops is at this frequency. The magnetic flux density is approximately 1000 times higher than the reference level in the International Commission on Non-ionising Radiation Protection (ICNIRP) guidelines. For assessment of genotoxicity, we studied cell growth, comet assay, micronucleus formation and hypoxanthine-guanine phosphoribosyltransferase (HPRT) gene mutation. Heat shock protein (Hsp) 27, 70, 105 and phosphorylated Hsp27 were evaluated as indicators of the stress responses.We did not detect any effects of the IF magnetic fields on cell growth, comet assay, micronucleus formation, HPRT gene mutation, expression of phosphorylated Hsp27, or nuclear translocation of Hsp27, 70 or 105.Our results indicate that exposure to an IF magnetic field at 6.05 mT(rms) for 2 h does not cause detectable cellular genotoxicity, and does not induce detectable cellular stress.