Adult granulosa cell tumors (AGCT) are associated with ascites in 10% of the cases. Although these tumors form two per cent of all ovarian tumors, they may create a diagnostic challenge in cytologic preparations. The tumor cells are not readily shed in the fluid. A case of a 47-year-old woman with presence of granulosa tumor cells in ascitic fluid is presented. Because of its rarity, AGCTs can be confused with other ovarian tumors.