A case report of mucin producing pancreatic tumor with intrapancreatic invasion detected by peroral transpapillary pancreatoscopy (pops) and intraductal ultrasonography (id us)

A 70-year-old female was visited to our hospital because of a hypoechoic tumor in the pancreas head with the dilated main pancreatic duct detected by US in another hospital. We diagnosed it as a mucin producing tumor of the pancreas by US, endoscopic ultrasonography (EUS) and endoscopic retrograde cholangiography (ERCP). And then we diagnosed it as adenoma or carcinoma in situ by EUS and intraductal ultrasonography (ID-US). Peroral transpapillary pancreatoscopy (POPS) was useful to determine the resection line. Histological diagnosis of the resected specimen was cystadenoma. EUS, POPS and ID-US is advantageous to make a differential diagnosis between neoplasm and hyperplasia, and to delineate its intraductal and extraductal extension.