Squamous Cell Carcinoma arising in a Cystic Teratoma.

Malignant transformation in a benign cystic teratoma occurs in 1-3% of cases. A rare case of squamous cell carcinoma arising in a benign cystic teratoma of ovary in a 37 year old female is reported. The patient presented with increasing abdominal girth and pain abdomen and was clinically diagnosed having a large ovarian cyst.