Adult Granulosa Cell Tumour With Heterologous Adipocytic Differentiation: Report of a Unique Case.

Adult granulosa cell tumor is the most common malignant ovarian sex cord-stromal tumor and heterologous elements, in the form of hepatocytes or mucinous epithelium, have rarely been described in these neoplasms. Here, we report an adult granulosa cell tumor in a 61-year-old woman with classic and luteinized elements and exhibiting a previously unreported feature in the form of foci of mature adipocytes. In reporting this case, we review heterologous adipocytic elements and other heterologous elements in ovarian sex cord-stromal tumors and speculate on the pathogenesis of the adipocytic differentiation.