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Immature teratoma of the ovary on fluid cytology

A case of an immature teratoma of the ovary in the peritoneal fluid of a 10‐yr‐old girl who presented with a pelvic mass is presented and discussed. The ThinPrep® preparation showed a few tight clusters of small tumor cells with a high nuclear/cytoplasmic ratio, round to oval nuclei with evenly distributed chromatin and one to two small distinct nucleoli, and scanty cytoplasm. The presence of immunohistochemical‐confirmed glial tissue on the cell block preparation confirmed the diagnosis of an immature ovarian teratoma. The differential diagnosis of fluid cytology is discussed. Diagn. Cytopathol. 25:411–414, 2001. © 2001 Wiley‐Liss, Inc.