A rare case of colonic ulcer.

A 72-year-old woman presented to our outpatient department due to diarrhea that began 10 days ago without a known trigger. The patient presented with frequent (four to five times a day), loose yellow stool, containing significant mucus. She reported no obvious symptoms such as abdominal distension, pain, chills or fever, and her medical history included diabetes and hypertension. Physical examination of the abdominal was unremarkable. To determine the cause of diarrhea, we ordered a colonoscopy for her. To determine the diagnosis, we performed colonoscopy which detected local mucosal edema and erosion of the sigmoid colon, with discharge from the erosion site. Subsequently, we performed enhanced computed tomography scan on the abdomen. The scan revealed that the appendix was thickened, and a patchy mixed density shadow was observed in the lower right abdominal cavity, measuring about 37mm*32mm, which could not be separated from the wall of the appendix and sigmoid colon. The patient is currently receiving standard treatment with antibiotics, and we will discuss whether surgery or puncture drainage intervention is needed in the future.