Papillary mucinous adenoma arising in adenomyomatous hyperplasia of the gall bladder

Abstract

A case of papillary mucinous adenoma arising in adenomyomatous hyperplasia (AMH) ofthe gall bladder is reported. The lesion was unsuspected and discovered by routine palpation ofthe gallbladder during laparotomy. The adenoma developed within fundalAMHand showed cytological atypia. This case illustrates that neoplastic proliferation is indeed possible in AMH and challenges the classical opinion that AMH is devoid of neoplastic potential.