Adnexal torsion is a rare pathology secondary to the total or partial rotation of the adnexa around its vascular axis. The occurrence of adnexal torsion on a healthy ovary is an even rarer situation. The diagnosis remains difficult, due to the ascension of the ovary in advanced pregnancies, which can mimic other surgical emergencies such as acute appendicitis, cholecystitis or acute pyelonephritis. The interest of this situation lies in its diagnostic difficulty, and in the choice of the therapeutic attitude to adopt. We present the case of adnexal torsion on a healthy ovary in the second trimester of pregnancy.