: Granulosa tumors are rare ovarian tumors with a better prognosis compared to other ovarian tumors. Their progression is usually slow, and the tumor remains confined to the ovary for a long time. The adult form characterized by microfollicular proliferation, a coffee bean appearance and Call Exner bodies is the most common. The solidocystic appearance of these tumors is generally nonspecific and diagnosis can be difficult preoperatively. However, the hormonal secretion that accompanies it helps guide the diagnosis and guide treatment. Surgery remains the basis of treatment and must be extensive in elderly patients. It carries a risk of recurrence which can occur several years after the excision surgery. We report the observation of a 38-year-old patient with a history of a mother suffering from breast cancer, who presented with a granulosa tumor of the left ovary diagnosed postoperatively. The epidemiological, clinical and therapeutic aspects are discussed.