Aneurysmal bone cyst in the hamate.

Aneurysmal bone cysts (ABCs) show a predilection for the metaphysis of the long bones and the vertebrae and seldom involve the carpal bones. We present a case of an ABC in the left hamate of an 18-year-old man. Curettage and bone grafting were performed, and, because destruction of the cortex was extensive, the hamate was excised. At 3-year follow-up, the wrist was stable.