A large giant cell tumor of the sacrum. Advantage of an abdomino-sacral approach.

We report a case of giant cell tumor of the sacrum, presenting with sacral pain, swelling, and change of bowel habits. Rectal examination revealed a huge retrorectal mass fixed to the sacrum but not to the wall of the rectum. Abdominal ultrasonography, computed tomography CT scan, and magnetic resonance imaging MRI showed a huge pelvic mass invading the sacrum.