Available online 8 March 2024

A 66-year-old man presented with a 15-day history of lower abdominal pain and diarrhea. He had no medical history of constipation and denied taking any non-steroidal anti-inflammatory drug. Physical examination showed that his abdomen was soft. Laboratory tests revealed that his hemoglobin, albumin, and C-reactive protein were within normal limits. His fecal occult blood test was positive. Contrast-enhanced CT examination of the abdomen detected thickening and edema of the rectal canal wall (

This work was supported by the Department of Health of Zhejiang Province (2019RC302)

The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. Written informed consent was obtained from the patient for publication of this “Online Images in the Medical Sciences”.

Collection of data and writing: Yibing Hu and Jin Ding; data analysis and interpretation: Yibing Hu and Jin Ding; writing and final approval of the manuscript: Qunying Wang

The authors have no conflicts of interest to declare.

© 2024 Published by Elsevier Inc. on behalf of Southern Society for Clinical Investigation.