Villous tumors of the stomach are somewhat rare with approximately 100 cases only reported in the literatures and have tendency to undergo malignant transformation as high as 72%. They are frequently multiple and associated with other gasrtrointestinal neoplasm. Thirty percent of them are associated with an independent gastric carcinoma. Gastric villous tumor has certain radiologic characteristics that may permit a preoperative diagnosis and also some distinctive clinicopathologic features which make early diagnosis and proper treatment possible. We experienced a 64-year-old man who complained of prolonged general weakness, weight loss for several months and left upper quadrant pain for four days. Esophagogastroduodenoscopy and barium study of upper gastrointestinal tract demonstrated typical, irregular, frond-like surfaced villous tumor occupying nearly whole gastric lumen and located eccentrically along the lesser curvature side. Endoscopic biopsy of the tumor revealed a gastric villous tumor with carcinomatous change.
Adenoma, Villous/pathology/radiography ; Carcinoma/pathology/radiography ; Humans ; Male ; Middle Aged ; Stomach Neoplasms/*pathology/radiography

Choledochal cyst is an uncommon premalignant anomaly. The morphology and pathogenesis of the premalignant lesion of cholangiocarcinoma arising from the choledochal cyst has not been well described. Herein, we report a rare case of bile duct adenoma arising from choledochal cyst with anomalous union of pancreaticobiliary duct (AUPBD). 50-year-old woman was admitted to our hospital with the complaint of epigastric pain. She had received common bile duct (CBD) exploration and choledocholithotomy and cholecystectomy 3 months earlier under the diagnosis of multiple CBD stones. Intraoperalive cholangiogram was not remarkable except CBD dilatation at that time. Endoscopic retrograde cholangiopancreatography revealed choledochal cyst with AUPBD and round filling defect which disappeared easily on the balloon cholaniogram. On magnetic resonance cholangiopancreatography, the filling defect was confirmed as 2 cm polypoid mass attached to the distal bile duct wall. At laparotomy, a soft whitish mass was palpable on the lower CBD. On histological examination, adenoma with focal carcinoma change arising from choledochal cyst was diagnosed.
Adenoma, Villous/*diagnosis/pathology/radiography ; Bile Duct Neoplasms/*diagnosis/pathology/radiography ; Cholangiopancreatography, Magnetic Resonance ; Choledochal Cyst/*radiography/secretion/surgery ; Female ; Humans ; Middle Aged ; Tomography, X-Ray Computed