1. An Aneurysmal bone cyst is an expansile osteolytic lesion with a thin wall, containing blood-filled cystic cavities

2. Aneurysmal bone cysts are benign expansile osteolytic neoplasms with a predilection for long bones and the posterior elements of the spine

3. The term "Aneurysmal" refers to the explosive, expansile nature of the bone containing the Aneurysmal bone cyst, similar to the enlargement seen with blood vessel or heart aneurysms