Adenoma malignum, also known as gastric-type mucinous adenocarcinoma of the cervix, is a rare variant of mucinous adenocarcinoma, previously referred to as minimal deviation adenocarcinoma. It accounts for approximately 1–3% of all cervical adenocarcinomas. Adenoma malignum is often associated with Peutz-Jeghers syndrome and mucinous tumors of the ovary. This case is unique due to its prolonged indolent clinical course, with no evidence of local invasion or metastasis over a period of six years, underscoring the deceptively benign clinical, radiological, and pathological appearance of this malignancy. We emphasize the subtle diagnostic clues that can facilitate early recognition of this rare but aggressive entity.

Keywords:Adenoma malignum; Cervical cancer; Peutz–Jeghers syndrome