Ovarian vein thrombosis (OVT) is a rare, potentially severe complication of the postpartum. Its diagnosis is often difficult due to its misleading clinical presentation. We report the observation of a 38-year-old patient who presented a right iliac fossa pain with fever at ninth day of cesarean section. The diagnosis of OVT was established by the abdominopelvic CT scan. The patient was treated with antibiotic and anticoagulant with an improvement of her state.