Cystic juvenile granulosa cell tumor of the ovary.

Sex cord-stromal tumors comprise approximately 5% of ovarian neoplasms and among these the granulosa cell tumor is the one most commonly seen (1). Two histopathologically well defined patterns of granulosa cell tumor are known: the common adult granulosa cell tumor (AGCT), and the less frequent juvenile granulosa cell tumor (JGCT) (1, 2, 3, 4). In addition to morphological variation, the two tumor types differ in prognosis and clinical course (4, 5, 6, 7, 8).