We report a case of juvenile granulosa cell tumor of the ovary in a 7.4 years old girl, who presented isosexual pseudo-precocious puberty of progressive outcome and palpable hypogastric mass. Hormonal measurements showed: oestradiol: 296pg/ml; 17-a-OH-progesterone: 20ng/ml; DHEAS: 27µg/dl; bhCG: 0.66mIU/ml; testosterone: 120ng/dl; progesterone: 3.4ng/ml; LH: 0.5mIU/ml; and FSH: 0.01mIU/ml not responsive to GnRH test (Relisorm®: 100µg iv). Abdominal images confirmed left ovarian mass. Unilateral salpingo-oophorectomy was performed with complete resection of a 656g and 14.5 x 10 x 7cm […]