# Case Report: A case of perirectal abscess complicated with rectal necrosis

## TL;DR

This case report describes a rare instance of rectal necrosis following a perirectal abscess and the successful surgical treatment approach.

## Contribution

The paper presents a rare clinical case of rectal necrosis complicated by a perirectal abscess and its management.

## Key findings

- Rectal necrosis is a rare complication of ischemic proctitis, occurring in 2%–5% of ischemic colitis cases.
- A one-stage incision and drainage followed by sigmoid colostomy led to a favorable surgical outcome.
- Multidisciplinary collaboration was essential for successful treatment and a 6-month positive follow-up.

## Abstract

Rectal necrosis represents the extreme progression of ischemic proctitis. Given the unique blood supply of the rectum, which features an extensive collateral circulation, cases of rectal necrosis are extremely rare, accounting for 2%–5% of the ischemic colitis cases. The etiology and pathogenesis of rectal necrosis encompass acute vascular occlusion, severe vascular diseases, low blood flow states, and factors such as radiotherapy, vasculitis, and mesenteric venous myointimal hyperplasia. Herein, we report a rare case of perirectal abscess complicated by rectal necrosis at the Anorectal Surgery Department of Bao'an Traditional Chinese Medicine Hospital in Shenzhen. The patient underwent a one-stage incision and drainage for a rectal abscess, followed by sigmoid colostomy and a two-stage reversal of the sigmoid colostomy; all procedures were performed through multidisciplinary collaboration. The surgical outcome was favorable after a 6-month follow-up.