A young woman presenting with right iliac fossa pain was found to have a palpable mass. Ultrasound and computed tomography demonstrated a calcified solid mass, which was extraintestinal on barium enema. Laparotomy confirmed an infarcted left ovarian cyst due to torsion of an attenuated but intact fallopian tube. To our knowledge, this is the first documented case of ovarian autoamputation in evolution. A migrating left ovary should be added to the differential diagnosis of a painful right iliac fossa mass.