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Background/aims: When determining the subsequent management after endoscopic resection of the early colon cancer (ECC), various factors including the margin status should be considered. This study assessed the subsequent management and outcomes of ECCs according to margin status., Methods: We examined the data of 223 ECCs treated by endoscopic mucosal resection (EMR) from 215 patients during 2004 to 2014, and all patients were followed-up at least for 2 years., Results: According to histological analyses, the margin statuses of all lesions after EMR were as follows: 138 cases (61.9%) were negative, 65 cases (29.1%) were positive for dysplastic cells on the resection margins, and 20 cases (8.9%) were uncertain. The decision regarding subsequent management was affected not only by pathologic outcomes but also by the endoscopist's opinion on whether complete resection was obtained. Surgery was preferred if the lesion extended to the submucosa (odds ratio [OR], 25.46; 95% confidence interval [CI], 7.09-91.42), the endoscopic resection was presumed incomplete (OR, 15.55; 95% CI, 4.28-56.56), or the lymph system was invaded (OR, 13.69; 95% CI, 1.76-106.57). Fourteen patients (6.2%) had residual or recurrent malignancies at the site of the previous ECC resection and were significantly associated with presumed incomplete endoscopic resection (OR, 4.59; 95% CI, 1.21-17.39) and submucosal invasion (OR, 5.14; 95% CI, 1.18-22.34)., Conclusions: Subsequent surgery was associated with submucosa invasion, lymphatic invasion, and cancer-positive margins. Presumed completeness of the resection may be helpful for guiding the subsequent management of patients who undergo endoscopic resection of ECC.

Asia has the highest incidence of Henoch-Schönlein purpura (HSP). Although 50% to 75% of patients with HSP manifest gastrointestinal (GI) symptoms, endoscopic, and pathologic findings of HSP have been rarely reviewed in Asia.Patients diagnosed with HSP who had undergone endoscopic biopsy from GI tract (GIT) in Soonchunhyang University Seoul Hospital from 2000 to 2018 were evaluated and 25 cases with 44 biopsies from upper GI tract (U-GIT) or lower GI tract (L-GIT) were enrolled. Their clinical and endoscopic findings and histologic findings of endoscopic biopsy were reviewed.Of the 25 patients, 15 were males and 10 were females. There were 6 children and 19 adults. The most common GI symptom was abdominal pain (20/25), followed by loose stool or diarrhea (9/25). Biopsied sites included 19 from U-GIT (9 stomach and 10 duodenum) and 25 from L-GIT (7 terminal ileum, 1 cecum, 4 ascending, 1 transverse, 2 descending, 7 sigmoid, and 3 rectum). Erythema/petechia was the most common endoscopic finding in U-GIT, while erosion/ulceration was the most common one in L-GIT. In U-GIT, extravasted red blood cell (RBC) (14/19) was the most common histologic finding, while leukocytoclastic vasculitis (LCV)/capillarities were identified in 7 specimens, including 5 duodenum samples. In endoscopic investigations of L-GIT, erosion/ulceration (9/14) was predominantly identified. The most common histologic finding was also extravasted RBC (22/25), while LCV/capillarities were noted in 10 specimens, including 5 specimens from terminal ileum.The HSP commonly involves GIT. Histologic findings of our cases were not significantly different from results of previous studies in Western countries. However, endoscopic and pathologic characteristics of HSP have been rarely reviewed in Asia. Herein, we share experience of endoscopic biopsy of GIT in patients with HSP.

The original version of the article unfortunately contained errors in author affiliation. Affiliation of third and ninth author was incorrectly assigned.

Background: Endoscopic submucosal dissection (ESD) with snaring (hybrid ESD) bridges the gap between ESD and endoscopic mucosal resection. We evaluated factors predictive of en bloc and complete resection of large colorectal neoplasms using hybrid ESD., Methods: This was a prospective clinical study of 78 patients who underwent hybrid ESD for excision of colorectal neoplasms (≥ 2 cm) between May 2015 and September 2016 at six university hospitals. We evaluated lesion and patient characteristics, endoscopist experience level (< 50 or ≥ 50 cases with colorectal ESD), and technical factors such as concurrent fibrosis, completion of a circumferential incision, degree of submucosal dissection (< 50 or ≥ 50%), and visualization during snaring (< 50 or ≥ 50%)., Results: Multivariate analyses showed that the en bloc resection rate was significantly related to the degree of visualization during snaring (odds ratio (OR) 7.811, 95% confidence interval [CI] 1.722-35.426; p = 0.008) and the presence of fibrosis (OR 0.258, 95% CI 0.68-0.993; p = 0.049). The complete resection rate was significantly related to the colorectal ESD endoscopist skill level (OR 5.626, 95% CI 1.485-21.313; p = 0.011) and gross lesion type (OR 0.145, 95% CI 0.022-0.936; p = 0.042). When all three technical factors, i.e., completion of circumferential incision, ≥ 50% submucosal dissection, and ≥ 50% visualization during snaring, were satisfied performing hybrid ESD, the en bloc resection rate (87.5%) was similar to that of ESD., Conclusions: Visualization during snaring, presence of fibrosis, gross lesion type, and endoscopist colorectal ESD experience level affect en bloc or complete resection of large colorectal neoplasia using hybrid ESD.

Rationale: Mediastinal and retroperitoneal fibrosis as a manifestation of metastasis from malignancies is rare disease and particularly, cases of mediastinal fibrosis have been rarely reported., Patient Concerns: A 60-year-old woman presented with dyspnea and bilateral flank pain. The patient had no previous history of malignancy., Diagnoses: A contrast-enhanced chest computed tomography scan revealed a left breast mass and infiltrative soft tissue masses in the mediastinum and retroperitoneum, which showed high fluorodeoxyglucose uptake on positron emission tomography scan. The left breast mass was proven as a malignancy on biopsy and surgical excisional biopsy of the mediastinal mass revealed metastasis from the breast cancer on histopathologic examination., Interventions: Our patient was treated with palliative hormone therapy for the primary breast cancer and metastasis with mediastinal and retroperitoneal fibrosis., Outcomes: Follow-up imaging studies showed improvement of the primary breast cancer and also metastasis., Lessons: We report this rare case to emphasize that mediastinal and retroperitoneal fibrosis can be a presentation of metastasis from various primary malignancies. We expect that appropriate diagnosis and treatment for metastatic mediastinal and retroperitoneal fibrosis can have a beneficial effect on disease course and prognosis of the patient.

Cytomegalovirus (CMV) reactivation is common in patients with severe ulcerative colitis (UC), and may ref lect exacerbation of mucosal inf lammation and/or administration of immunosuppressants. The question of whether CMV is an active pathogen or 'an innocent bystander' in the exacerbation of UC remains controversial. Patients with UC exacerbated by reactivated CMV experience worse prognoses than those without CMV reactivation and antiviral therapy significantly reduces the need for colectomy in patients with severe UC and high-grade CMV infection, indicating that CMV plays a role in UC prognosis. Therefore, the CMV status of patients on immunosuppressants, particularly those with steroid-refractory or -dependent UC, should be tested. When CMV is detected, be performed based on should adequate treatment the extent of the viral load and the presence of certain clinical features including a large ulcer. Anti-tumor necrosis factor agents may be useful for treating CMV colitis complicating UC.

Tamoxifen has been widely used for adjuvant treatment of breast cancer, but several gynecological side effects have been noted, including endometrial hyperplasia, polyp and carcinoma. Polypoid endometriosis is one of the extremely rare benign complications associated with tamoxifen therapy. A 66-year-old postmenopausal woman, who had received left partial mastectomy due to breast cancer (about 4 years ago) and was taking tamoxifen treatment, had an ovarian cyst on ultrasonography. Pelvic magnetic resonance imaging suggested tamoxifen-associated endometrial and ovarian changes, especially a 4.1×3.4-cm-sized, well-defined, multicystic mass in the right ovary. She received hysterectomy with bilateral salpingo-oophorectomy. Microscopically, the right paratubal mass showed endometrial glands and stroma, and immunohistochemical staining for CD10 confirmed the endometrial nature of the stroma. Three cases of polypoid endometriosis have been reported in the Korean literature, but in none of the cases, polypoid endometriosis was associated with tamoxifen use. Herein, we report the first case of polypoid endometriosis associated with tamoxifen treatment in Korea.

The authors report a rare case of Horner syndrome in a patient with neurofibromatosis type 1 (NF-1). A 31-year-old man visited the clinic with drooping left eyelid. The physical examination revealed ptosis of the left eyelid, miotic pupil, facial anhidrosis, and several skin masses on the chest. The radiological examination of the chest demonstrated a well-defined left posterior mediastinal mass close to the vertebral bodies of the upper thoracic spine at the level of T1-T5. The masses of mediastinum and skin were totally removed. They were diagnosed as neurofibromas. Neurofibromatosis type 1 was diagnosed. To the best of my knowledge, this is a rare case of a patient with NF-1 who presented with Horner syndrome. Clinicians should be vigilant on the possibility of Horner syndrome in patients with NF-1.

Competing Interests: No potential conflict of interest relevant to this article was reported.

Metastatic mucinous adenocarcinoma of appendix origin and mimicking a gastric subepithelial tumor (SET) is very rare. Endoscopic ultrasound (EUS)-guided sampling is a useful diagnostic method for SETs. However, the cytologic findings of metastatic mucinous adenocarcinoma are unfamiliar to many pathologists and gastroenterologists. These findings present a diagnostic challenge because the introduction of gastric epithelium and mucin into the specimen during the procedure can be misleading. This is the first reported experience of an EUS-guided sampling of a gastric SET in a patient with suspected appendiceal tumor, to make the diagnosis of a mucinous adenocarcinoma.

Primary mucosal melanomas of the head and neck are rare. In addition, second primary mucosal melanoma following primary cutaneous malignant melanomas is very rare. We report a second primary mucosal melanoma. A 76-year-old woman, who had a previously cutaneous malignant melanoma of the left foot, visited with a complaint of a foreign body sensation of the throat. Endoscopy revealed a black mass at the left piriform sinus of the hypopharynx. After wide surgical excision of the lesion and reconstruction with a radial forearm free flap, the histopathology was confirmed to be a second primary mucosal malignant melanoma of the hypopharynx. Five months postoperatively, masses were palpated in the neck, and metastasis was diagnosed. The patient was treated with adjuvant chemotherapy and radiotherapy. Eight months postoperatively, computed tomography scans showed other metastatic masses in the liver, spleen, both adrenal glands, soft tissues of the abdominal wall, and both lungs. After that, the patient died 9 months postoperatively. We report a rare case of second primary mucosal malignant melanoma of the hypopharynx. Although rare, this case shows that a detailed examination of the hypopharynx and the head and neck should be a part of the follow-up examination in all cutaneous malignant melanoma patients.

The presence of ectopic prostate tissue in the bladder is common, but the involvement of the bladder dome has rarely been reported. This case report describes a 72-year-old man who presented with gross painless hematuria. Cystoscopy revealed a smooth sessile mass at the dome region of the bladder. A complete transurethral resection of the mass was performed. Histopathological examination of the mass revealed the presence of benign ectopic prostatic tissue.

Systemic sclerosis (SSc) is a chronic systemic disease that affects the skin, lungs, heart, gastrointestinal tract, kidneys, and musculoskeletal system. Although up to 90% of patients with scleroderma have been estimated to have gastrointestinal involvement, liver disease has been reported only rarely. A 51-year-old woman was hospitalized due to esophageal variceal bleeding. Her serum was positive for anti-nuclear antibody and anti-centromere antibody. Sclerodactyly was noted on both hands, and she had recently developed Raynaud's syndrome. Punch biopsy of the hand showed hyperkeratosis, regular acanthosis, and increased basal pigmentation in the epidermis, and thick pale collagenous bundles in the dermis. Liver biopsy showed chronic active hepatitis with bridging fibrosis. Consequently, she was diagnosed with liver cirrhosis due to autoimmune hepatitis (AIH) combined with SSc. AIH had subsided after administration of prednisolone at 40 mg per day. She received 5-10 mg/day of prednisolone as an outpatient, and her condition has remained stable. Patients with either AIH or SSc should be monitored for further development of concurrent autoimmune diseases. The early diagnosis of AIH combined with SSc will be helpful in achieving optimal management.

Colonic sarcomatoid carcinomas are known to be extremely rare tumors, with only 22 cases reported either as sarcomatoid carcinomas or carcinosarcomas in the literature. The known characteristics are rapid growth, a high recurrence rate, and an extremely poor prognosis. Herein we report a case of a patient who had a sarcomatoid carcinoma of the sigmoid colon and died only 22 days after surgery due to rapid tumor growth.

Sclerosing stromal tumor (SST) is a rare benign ovarian neoplasm classified as a type of sex cord stromal tumor that occurs predominantly in young patients. Several reports have described the US, CT and MR features of SST, but there have been no reports of a bilateral calcified SST in a child. We present a case of a bilateral SST of the ovary with calcification in a 12-year-old premenarchal girl and describe the US, CT, MR and pathological findings.

Nonalcoholic steatohepatitis (NASH), one of the NAFLDs (nonalcoholic fatty liver diseases), is regarded as a hepatic manifestation of metabolic syndrome. NASH can progress to cirrhosis, and possibly to hepatic malignancy. Currently, liver biopsy is the only reliable method of assessing the presence or absence of NASH and the stage of fibrosis. The finding of steatosis with evidence of hepatocyte injury such as inflammation, ballooning, degeneration, and/or fibrosis, is generally essential for making a diagnosis of NASH. However, its diagnostic criteria have not yet been established. The pathologic findings of NASH and related diseases, and the grading system currently in use are reviewed herein.

The solitary fibrous tumor (SFT) of peritoneum, especially arising in gastric serosa, is extremely rare. A case of SFT arising in gastric serosa of a 70-year-old man is reported. On abdominal computed tomography scan, an approximate 8.0 x 5.3 cm-sized solid mass with multiple nodular calcifications was noted in the omentomesentery of right upper abdomen, which was abutting to the gastric antral wall. At laparotomy the tumor was tightly attached to the gastric serosa and was completely excised by wedge resection of the stomach. The cut surfaces of the tumor were pale brown to pale yellow, firm, with multifocal yellowish, gritty, stony-hard nodules and cystic changes. Microscopically, the tumor was composed of mildly cellular benign-appearing spindle-shaped cells and bands of hyalinized collagen in varying proportions. The tumor revealed predominantly sclerosing pattern with extensive hyalinized fibrosis and multifocal dystrophic calcifications. The tumor was mainly located at the gastric serosa and subserosa, and its growth pattern was expansile with entrapping of muscularis propria and submucosa in the periphery of the tumor. By immunohistochemistry, the tumor cells were diffusely positive for CD34 and vimentin but negative for cytokeratin, desmin, smooth muscle actin, CD99 and c-kit. Although its occurrence is rare, SFT should be considered in the differential diagnosis of mesenchymal tumors of the stomach.