Enterocystic Fistula Caused by Squamous Cell Carcinoma Arising From a Dermoid Cyst

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Fistula formation and malignant transformation both are rare complications of ovarian cystic teratomas.

Case summary

We report the case of a 61-year-old woman with benign ovarian cystic teratoma with transformation into squamous cell carcinoma, resulting in an enterocystic fistula. The cancerous and fistulous nature of the cystic lesion seen on the native abdominal radiogram that was responsible for the symptoms was clarified only after laparotomy. Bilateral salpingo-oophorectomy and hysterectomy were performed, and the patient received postoperative chemotherapy. She is well with no evidence of disease after 9 months of follow-up.


To the authors' knowledge this is the combination of very exceptional complications that have never been reported.


Because of the rarity of malignant tumors arising from dermoid cysts, there is little experience with their treatment. Some recommend a treatment similar to that of surface epithelium-derived carcinomas of the ovary.

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