Abstract
Benign tumors such as adenomyomatous hyperplasia (AMH) rarely occur in the bile duct. As no characteristic diagnostic imaging findings have been suggested, accurate preoperative diagnosis is currently difficult. Here, we report a case of AMH that occurred in the papilla of Vater.
The patient was a 70-year-old man who was referred to our hospital for detailed examination of obstructive jaundice. Levels of tumor markers such as DUPAN-II were found to be increased.
No redness or swelling of the papilla of Vater was found on endoscopic and macroscopic examinations.
Abdominal computed tomography revealed a mass lesion in the distal bile duct, while endoscopic retrograde cholangiography detected a filling defect. We performed subtotal stomach pancreaticoduodenectomy for suspected cancer of the papilla of Vater. Histologically, mildly atypical glands and hyperplasia of muscle fibers and fibrous tissue were observed. Based on these findings, a final diagnosis of AMH of the papilla of Vater was made.
