# Case Report: Multiple extragenital adenomatoid tumors in the rectum and small intestinal mesentery

## TL;DR

A 39-year-old man had multiple rare benign tumors in his rectum and small intestine mesentery, successfully treated with surgery and no recurrence after 17 months.

## Contribution

This case report highlights the rare occurrence of multiple extragenital adenomatoid tumors and their imaging features to prevent misdiagnosis.

## Key findings

- Multiple extragenital adenomatoid tumors were diagnosed in the rectum and small intestinal mesentery.
- Laparoscopic total excision led to full recovery with no recurrence observed over 17 months.
- Imaging features of these rare tumors were identified to aid in accurate diagnosis and treatment.

## Abstract

Adenomatoid tumors (ATs) are benign tumors commonly found in the genital organs, usually occurring as a single mass with a good prognosis after surgery. However, multiple extragenital ATs are extremely rare, often asymptomatic, and may lead to misdiagnosis. This case report describes a patient with multiple ATs involving the rectum and small intestinal mesentery. The patient was a 39-year-old man who had been suffering from abdominal pain and recurrent loose stools for 6 months. Diagnostic contrast-enhanced computed tomography (DCE-CT) of the abdomen and pelvis showed multiple cystic–solid masses with uneven density and patchy enhancement at the edges. The patient underwent laparoscopic total excision, and postoperative pathology confirmed multiple extragenital ATs in the rectum and small intestinal mesentery. The patient recovered well, and no recurrence was observed during a 17-month follow-up. This case aims to raise awareness of the imaging features of multiple ATs in rare extragenital locations, preventing misdiagnosis, missed diagnosis, and excessive treatment.