We report a case of ovarian torsion in a 3-month-old infant that is extremely rare, severe and a diagnostic and therapeutic emergency. The clinic was nonspecific, represented by crying abdominal pain. The diagnosis was guided by pelvic ultrasound by showing a heterogeneous hypoechoic lateral vein mass with small internal cystic images, without color Doppler flow. The MRI confirmed this by highlighting the ovarian origin of the mass and the twisting of the ovary pedicle hyposignally T2 between the ovary and the uterus. The treatment consisted of conservative surgery.