Abstract
A 51-year-old man visited our hospital because of bloody diarrhea and tenesmus. Colonoscopy revealed multiple shallow punched out ulcers without white exudates, in the caecum and whole colon. In the rectum, ulcers with white exudates, which were surrounded by reddish and edematous mucosa, were seen. Biopsy specimen taken from the rectal ulcer disclosed Entamoeba histolytica trophozites. Based on these findings, this patient was diagnosed amoebic colitis. After treatment with metronidazole 750mg/day, his symptom and colonoscopic findings were improved.
Although colonoscopic findings of amoebic colitis typically include multiple edematous ulcers with white exudates or aphtoid erosions, our patient had multiple shallow punched out ulcers without white exudates. This case shows that when encountering such lesions, the possibility of amoebic colitis must be considered.
