Aneurysmal bone cyst

Aneurysmal bone cyst is a benign osteolytic bone neoplasm characterized by blood filled spaces separated by fibrous septa. The term aneurysmal is mainly derived from its macroscopic appearance.
The tumor can have an occurrence anywhere that there is bone. Approximate percentages by sites are as shown:
Skull and mandible (4%)
Spine (16%)
Clavicle and ribs (5%)
Upper extremity (21%)
Pelvis and sacrum (12%)
Femur (13%)
Lower leg (24%)
Foot (3%)


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