aneurysmal bone cyst

aneurysmal bone cyst, a cystic lesion that tends to develop in the metaphyseal region of long bones but may occur in any bone, including a vertebra. It may produce pain and swelling and generally increases in size gradually. Skin temperature around the bone may increase. It is usually removed surgically, but radiation may be used in cases when the tumor is not readily accessible.

Aneurysmal bone cyst involving the proximal fibula (Silverberg et al, 2006)