Exfoliative cytology of a malignant fibrous histiocy toma arising in a dermoid cyst of the ovary

A malignant fibrous histiocytoma occurring in a der moid cyst of the ovary was examined cytologically in the imprint smear. Among the exfoliated cells, the histiocytic elements were predominant and looked aty pical, including foamy cells, multinucleated giant cells (Touton type) and various neoplastic giant cells. The fibrous elements were generally uniform and looked benign. These cytological features were in good acco rdance witn the diverse histologic pattern of the pres ent tumor.