Fibrosarcoma associated with a benign cystic teratoma of the ovary.

Objective: A case of ovarian fibrosarcoma associated with a benign cystic teratoma is described.

Methods: A 32-year-old patient with an ovarian tumor detected by routine gynecological examination was referred to our hospital. In addition to histopathological examination of the resected tumor, immunohistochemical studies as well as a cytogenetic analysis by comparative genomic hybridization were carried out.

Results: The 7-cm-sized tumor consisted of two different components: a fibrosarcoma and a benign cystic teratoma. The teratoma contained elements of all three germ layers and lacked any focus of immature teratoma. A fibrosarcoma was immediately connected to the teratoma. The sarcoma cells showed eight mitoses per 10 high-power fields on average and exhibited immunohistochemical reactivity for vimentin only. Cytogenetic analysis of the fibrosarcoma using comparative genomic hybridization revealed imbalances of chromosomes 9, 12, and 16. After a 1-year follow-up, there were no signs of tumor recurrence or systemic disease.

Conclusion: To the authors' knowledge, this is the second report of an association of ovarian fibrosarcoma and benign cystic teratoma, and the first including a cytogenetic analysis.