A benign teratoma of the ovary fistulating into the rectum.

A 39-year old mother of two children developed episodic left lower abdominal pain, alteration of bowel habit, haematochezia and occasional streaks of pus on stools of 6 months duration. She had regular 28 day menstrual cycles and had not used any contraceptives. There was no family history of ovarian, breast or colonic carcinoma. Clinical examination showed no abnormality in the abdomen. A sessile mass with a smooth surface was felt in the anterior rectal wall during digital rectal examination. Vaginal examination revealed a tender left adnexal mass. Flexible sigmoidoscopy showed a friable sessile lesion (about 2 cm in size) with a cluster of hair protruding through it. The biopsy showed inflammatory changes only.