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BACKGROUND: Main-duct (MD) intraductal papillary mucinous neoplasm (IPMN) is associated with malignancy risk. There is a lack of consensus on treatment (partial or total pancreatectomy) when the MD is diffusely involved. We sought to characterize the pancreatic remnant fate after partial pancreatectomy for non-invasive diffuse MD-IPMN. METHODS: Consecutive patients with partial pancreatectomy for non-invasive MD-IPMN from 2004 to 2016 were analyzed. Diffuse MD-IPMN was defined by preoperative imaging as dilation of the MD in the head of the pancreas more than 5mm and involving the whole gland. RESULTS: Of 127 patients with resected non-invasive MD-IPMN, 47 (37%) had diffuse MD involvement. Eleven of 47(23%) patients developed imaging evidence of progression or new cystic disease in the pancreatic remnant. Patients with diffuse MD-IPMN were older (73yrs vs 67yrs, p=0.009), more likely to receive a pancreaticoduodenectomy (96% vs 56%, p

Surgical resection of intraductal papillary mucinous neoplasm (IPMN) is strongly recommended for patients exhibiting high-risk stigmata (HRS). However, determining surgical indications for elderly patients with comorbidities is challenging, as clinical outcomes are not well characterized. This multicenter observational study elucidated the clinical outcomes of patients with IPMN exhibiting HRS who did not undergo surgery. This study enrolled 101 IPMN patients exhibiting HRS with follow-up observations at 11 hospitals in Japan (2011–2016). The median observation period was 37 months (maximum: 86 months). Primary outcomes were estimated 5-year overall survival (OS) and disease-specific survival (DSS). Survival was also stratified based on HRS features. Of 101 patients, 32 (31.7%) had the main pancreatic duct (MPD) measuring ≥ 10 mm and 80 (79.2%) had mural nodules measuring ≥ 5 mm. The estimated 5-year OS and DSS were 74% and 91%, respectively. In the stratified analysis, the co-presence of MPD ≥ 10 mm and mural nodules ≥ 5 mm or mural nodule ≥ 10 mm were related to worse 5-year DSS (MPD ≥ 10 mm and mural nodules ≥ 5 mm vs other characteristics: 60% vs 95%, log-rank test: p = 0.049; mural nodules ≥ 10 mm vs

Aim. To study the effectiveness of treatment of sialolithiasis by sialolithotripsy. Methods. Between 2015 and 2018, extracorporeal shockwave lithotripsy of salivary stones of 39 patients was performed in the Nasreddin Tusi Memorial Clinic. The stone was located in the submandibular gland and its duct for 33 patients and the parotid salivary glands and its duct for 6 patients. The average age of patients was 503.38 (between 22 and 77). Results. Stone fragmentation as a result of sialolithotripsy was achieved in 36 (92.7%) of 39 examined patients (p=0.031). In 3 patients the stone was completely fragmented, but due to the narrow lumen of the main duct, it did not move away. In 3 patients with calculus size more than 2 cm, the stone was not fragmented. According to our results, the necessary effect was achieved in 85% of cases and was unachieved in only 15% of cases. Conclusion. Given the complexity of the surgical treatment in patients with salivary stone and potential postoperative complications, especially with the stone localization within the parotid gland, we concluded that extracorporeal shockwave lithotripsy is a promising alternative treatment for patients with salivary stone.

Ectopic parotid main duct (Stensen's duct) orifice is a rare anatomic abnormality of the salivary gland. We report a case in which the patient's left Stensen's duct opened on the left buccal skin. After surgery to perform parotid duct transposition, the buccal fistula was closed, and the saliva secreted by the parotid gland could overflow smoothly through the new orifice throughout a 3-year follow-up period. We also performed a review of the current relevant data.

In recent years, there have been further advances in understanding of the acute pancreatic inflammation and its complications. Among these are emerging concepts such as peripancreatic necrosis and main duct injury secondary to necrotizing pancreatitis. To remain relevant to the clinical teams, radiologists need to be aware of these advances in knowledge and their reports should provide key points of information that may impact patient management. This article provides an up to date review of acute pancreatitis.

Described for the first time in 1982, intraductal papillary mucinous neoplasms have been widely studied so far. According to the site of origin and location, it seems that these tumors have a specific risk of malignisation and therefore their type of treatment as well as the moment in which it should be applied should be carefully tailored. In this respect, multiple therapeutic strategies have been proposed, ranging from follow up and limited excision to total pancreatectomy. The current paper is a literature review of the largest studies conducted on the theme of the therapeutic strategies in intraductal papillary mucinous neoplasms.

Introduction: Pancreaticoduodenectomy has been a radical treatment for periampullary carcinoma, which is a collection of malignant neoplasia of the periampullary region. Although the mortality has declined dramatically, the complications are still high. This study aims to determine the occurring rate of short-term complications after pancreaticoduodenectomy and to identify the risk factors related to those complications. Comprehension of these problems help increase the outcome. Materials and Method: It is a cross-sectional study of the patients with periampullary cancer, who undergo pancreaticoduodenectomy at Cho Ray Hospital from January 2012 to October 2016. Results: Overall complication rate was 25.65% from 230 patients. In which, pancreatic fistula and surgical site infection were the two most frequent complication (10.43% and 4.38% respectively). Pancreatic fistula was highly significantly associated with Wirsung’s duct diameter less than 3 mm (p = 0.015) and soften pancreatic parenchyma (p = 0.004). The soften pancreatic parenchyma also increased the risk of surgical site infection (OR 4.588), but it was not statistically significant (p = 0.056). Soften pancreatic parenchyma increased the haemorrhage complication significantly (p = 0.04) (OR: 10,668, 95% confidence). Discussions: Pancreatic main duct’s diameter, pancreatic density and Hemoglobin may relate to the early postoperative complications following pancreaticoduodenectomy. Detailedly, in particular for pancreatic fistula, 2 risk factors recognized are Wirsung’s diameter less than 3mm and soft pancreatic density. Meanwhile low concentration of hemoglobin in blood may increase the risk of incisional infection. Pancreatic density related to the complication of haemorrhage. Conclusions: Short-term complications’ rate following pancreatoduodenectomy remains high. Understanding the risk factors help us choose which case should be operated and do pre-operative preparation better.

Purpose To elucidate predictive factors for malignant main duct type IPMN (MD-IPMN). Methods All 29 subjects had mural nodules (MNs) in the main pancreatic duct (MPD) on preoperative endoscopic ultrasonography and underwent surgery (19, malignant; 10, benign). Possible predictive factors for malignancy such as background, imaging, and histological factors including histological subtype (HS), were evaluated. Results Multivariate analysis revealed an MPD diameter of ≥12 mm (p = 0.042) and non-gastric type (p = 0.001) to be the statistically significant predictive factors for malignancy. The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy to detect malignancy by using “an MPD diameter of ≥12 mm and/or non-gastric type” were 95%, 70%, 86%, 88%, and 86%, respectively. In 7 subjects in whom HS was preoperatively evaluated using pancreatic specimens obtained before surgery, the agreement rate of the preoperative HS with definitive HS evaluated using resected specimens was 86%. Conclusions For MD-IPMNs with MNs, “an MPD diameter of ≥12 mm and/or non-gastric type” are indicated for surgery. On the other hand, careful surveillance without immediate pancreatic surgery may be an option for MD-IPMNs showing both an MPD diameter of

The purpose of this study is to determine preoperative factors that are predictive of malignancy in patients undergoing pancreatic resection for intraductal papillary mucinous neoplasms (IPMN).IPMN of the pancreas may be precursor lesions to pancreatic cancer (PC) and represent a target for early diagnosis or prevention. While there has been much effort to define preoperative risk factors for malignant pathology, guidelines are ever-changing and controversy remains surrounding which patients would benefit most from resection.We performed a retrospective analysis of 901 consecutive patients obtained from two tertiary referral centers who underwent pancreatic resection for histologically proven IPMN between 2004 and 2017. Collected data included patient demographic characteristics, preoperative symptoms, radiological findings, and laboratory data.Main pancreatic duct (MPD) dilatation was the only variable that was significantly associated with increased probability of malignancy (defined high-dysplasia or invasion) on both univariate and multivariate analysis. Even middle-range MPD dilatation from 5 mm to 9.9 mm (n = 286) was associated with increased odds of HG-IPMN (OR = 2.74; 95% CI = 1.80-4.16) and invasion (OR = 4.42; 95% CI = 2.55-7.66). MPD dilatation10 mm (n = 150) had even greater odds of HG-IPMN (OR = 6.57; 95% CI = 3.94-10.98) and invasion (OR = 15.07; 95% CI = 8.21-27.65). A cutoff of 5 to 7 mm MPD diameter was determined to be the best predictor to discriminate between malignant and benign lesions.In agreement with current IPMN management guidelines, we found MPD dilatation, even low levels from 5 mm to 9.9 mm, to be the single best predictor of HG-IPMN or invasion, highlighting the critical role that MPD plays in the selection of surgical candidates.

To use MRCP to investigate age-related changes and gender differences of the pancreas and to correlate pancreatic gland size and duct diameter. In this institutional review, board-approved, HIPAA-compliant study, 280 patients (age 20–88 years) without a history of pancreatic or liver disease who had undergone MRI/MRCP from 2004 to 2015 were identified. The anteroposterior size and main duct diameter of the pancreatic head, body, and tail were measured. The pancreatic gland and duct sizes were compared between genders, and among seven age subgroups (20–29, 30–39, 40–49, 50–59, 60–69, 70–79, 80–89). The pancreatic head and body were significantly larger in males than females (head, p < 0.01; body, p = 0.03), while the tail and the duct diameters of the pancreatic head, body, and tail showed no gender difference. As the age of male participants increased, there was an associated increase in size of the pancreatic gland initially (largest at age 50–59 (body) and 60–69 (head)), followed by subsequent decline in size thereafter. Additionally, the pancreatic duct diameter was found to increase gradually. In females, the size of the pancreatic gland decreased, while the diameter of the pancreatic duct increased with age. Moderate positive correlation for gland size and strong positive correlation for duct diameter among different pancreatic regions were found. Weak negative correlation was found between gland size and duct diameter. There are gender differences in the gland size of the pancreatic head and body. The pancreatic gland size increases until the sixth decade in males, with a more continuous decrease in gland size with age in females. Both males and females demonstrate a marked decrease in gland size after the eighth decade. The duct diameter increases with age in both males and females.

There has been a paradigm shift in the understanding of the pathogenesis of sialoliths, also known as salivary calculi, as a result of clinicopathologic and experimental investigations that revealed that sialolithiasis is secondary to chronic sialadenitis. Clinical and histologic features were statistically analyzed in cases of chronic submandibular sialadenitis and revealed that there is a chronological progression of increasingly severe chronic sialadenitis with, in many cases, the eventual development of a sialolith. Postmortem and electronmicroscopic investigations revealed that microscopical concretions called sialomicroliths are present in all normal submandibular glands and a minority of normal parotids, and in all cases of chronic submandibular sialadenitis. However, sialomicroliths do not develop into sialoliths, and experimental investigations added the missing pathogenic link. Parasympathectomy of the submandibular gland of cat caused a greatly increased occurrence of sialomicroliths, which led to the realization that a lack of secretory activity causes sialomicroliths. The present understanding of the pathogenesis of sialoliths is as follows: secretory inactivity leads to an accumulation of sialomicroliths and allows ascent of the main duct by commensal microbes; impaction of sialomicroliths in small intraglandular ducts produces obstructive atrophic foci, in which the microbes can proliferate and cause inflammatory swelling, which is obstructive and may eventually involve the entire gland; partial obstruction of a large duct allows calcification of stagnant secretory material, which is rich in calcium, to accrete and become a sialolith. Any form of chronic sialadenitis or partial obstruction may eventually lead to the development of a sialolith.

Background/Objectives Intraductal papillary mucinous neoplasms (IPMNs) are classified into main duct (MD)-type IPMNs, branch duct (BD)-type IPMNs, and mixed type IPMNs. While MD-type IPMN has a high risk of malignancy and should therefore be considered for resection if the patient is fit, BD-type IPMN needs to be carefully judged for surgical indication. The decision to resect BD-type IPMN is often based on international consensus Fukuoka guidelines 2017, but further investigation is required. In this study, we focused on whether the location of the mural nodule (MN) could be an indicator of malignancy. Methods We enrolled 17 cases who had been diagnosed BD-type IPMNs which were surgically resected from January 2016 to December 2019. These cases were classified into benign and malignant group. Subsequently, a clinicopathological study was conducted based on the localization of MN (MN-central type or MN-peripheral type). Results Although MN was found in 57% (4/11) in the benign group, 88% (7/8) was noted in the malignant group, indicating the presence of MN to be more common in the malignant group. Those with MN consisted of 6 cases of MN-central type and 5 cases of MN-peripheral type. All cases of central type were malignant compared to only one case of the peripheral group being confirmed on histology as cancer. Conclusion BD-IPMN with central mural nodule should be considered high risk for malignancy.

Most models for predicting malignant pancreatic intraductal papillary mucinous neoplasms were developed based on logistic regression (LR) analysis. Our study aimed to develop risk prediction models using machine learning (ML) and LR techniques and compare their performances. This was a multinational, multi-institutional, retrospective study. Clinical variables including age, sex, main duct diameter, cyst size, mural nodule, and tumour location were factors considered for model development (MD). After the division into a MD set and a test set (2:1), the best ML and LR models were developed by training with the MD set using a tenfold cross validation. The test area under the receiver operating curves (AUCs) of the two models were calculated using an independent test set. A total of 3,708 patients were included. The stacked ensemble algorithm in the ML model and variable combinations containing all variables in the LR model were the most chosen during 200 repetitions. After 200 repetitions, the mean AUCs of the ML and LR models were comparable (0.725 vs. 0.725). The performances of the ML and LR models were comparable. The LR model was more practical than ML counterpart, because of its convenience in clinical use and simple interpretability.

Background The aim of this study was to investigate the outcomes of digital pancreatoscopy in main duct intraductal papillary mucinous neoplasm (MD-IPMN). Methods This was a multicenter retrospective study. Outcomes analyzed were safety, incremental pathology yield compared with previous cross-sectional/endoscopic ultrasound (EUS) imaging, and whether the surgical procedure was dictated by the pancreatoscopy. Results A total of 31 patients were enrolled from six tertiary care centers. Overall, 42 % of cases had findings on pancreatoscopy that were not seen on cross-sectional imaging or EUS. Digital pancreatoscopy dictated the type of surgery performed in 13 patients (42 %) who underwent surgery. However, in patients with a diffusely dilated pancreatic duct (> 10 mm), the pancreatoscopy dictated the type of surgery in 77 % of cases vs. 17 % of cases in the focally dilated pancreatic duct group (10/13 vs. 3/18; P = 0.001). Conclusion Digital pancreatoscopy should be considered in the diagnostic algorithm of MD-IPMN in patients with a diffusely dilated pancreatic duct and without any focal lesions seen on cross-sectional imaging or EUS.

Background: Intraductal papillary mucinous neoplasms (IPMNs) of the pancreas comprise a heterogeneous group of intraductal mucin-producing neoplasms representing a typical adenoma-to-carcinoma sequence. The involvement of the main pancreatic duct (MPD) is a feature of paramount importance, directly related to a more aggressive biology and a higher malignancy rate. Method: We review and discuss the clinical management of IPMNs with a MPD involvement, recalling the different consensus guidelines and addressing recent controversies in literature, presenting the current clinical practice in Verona Pancreas Institute. Results: All the aspects of surgical management were discussed, from the indication for surgery to the intraoperative management and the follow-up strategies. Conclusion: The management of presumed IPMNs involving the MPD at our Institution is in line with the International Association of Pancreatology 2012 guidelines, revised in 2016. Surgical resection proposed should achieve the complete removal of the tumor with negative margins. Despite a good prognosis in terms of survival of overall resected main duct intraductal papillary mucinous neoplasms, follow-up should not be discontinued.

Background: The risk of invasive cancer in resected intraductal papillary mucinous neoplasm with main pancreatic duct involvement is 33%–60%. Most guidelines, therefore, advise resection of main duct intraductal papillary mucinous neoplasm and mixed type intraductal papillary mucinous neoplasm in surgically fit patients, although advice on the surgical strategy (partial or total pancreatectomy) differs. We performed a survey amongst international experts to guide the design of future studies and help to prepare for a single international set of guidelines. Methods: An online survey including case vignettes was sent to 221 international experts who had published on main duct/mixed type intraductal papillary mucinous neoplasm in the previous decade and to all surgeon and gastroenterologist members of the pancreatic cyst guideline committees of the European Study Group and the International Association of Pancreatology. Results: Overall, 97 experts (67 surgeons, 30 gastroenterologists) from 19 countries replied (44% response rate). Most (93%) worked in an academic hospital, with a median of 15 years’ experience with intraductal papillary mucinous neoplasm treatment. In main duct/mixed type intraductal papillary mucinous neoplasm patients with pancreatic duct dilation (>5 mm) in the entire pancreas, 41% (n = 37) advised nonoperative surveillance every 3–6 months, whereas 59% (n = 54) advised operative intervention. Of those who advised operative intervention, 46% (n = 25) would perform a total pancreatectomy and 31% (n = 17) pancreatoduodenectomy with follow-up. No structural differences in advice were seen between surgeons and gastroenterologists, between continents where the respondents lived, and based on years of experience. Conclusion: This international survey identified a clinically relevant lack of consensus in the treatment strategy in main duct/mixed type intraductal papillary mucinous neoplasm among experts. Studies with long-term follow-up including quality of life after partial and total pancreatectomy for main duct/mixed type intraductal papillary mucinous neoplasm are required.