Aspiration biopsy of granulosa-cell tumor of the ovary: cytologic findings and differential diagnosis.

Fine-needle aspirates from four histologically confirmed adult granulosa-cell tumors of the ovary revealed irregular sheets, loose aggregates or tight clusters of small tumor cells with round or oval nuclei and scant cytoplasm. Nuclear grooves and indentations were noted in a small number of cells in two cases. Tumor cells arranged in follicular pattern mimicking Call-Exner bodies were not identified in all cases. A cytologic differential diagnosis of "small-cell" tumors of the ovary is briefly discussed.