The proximal femur is a common site of benign cystic lesions in either tumor or tumor-like conditions. Common benign lesions include giant cell tumor, enchondroma, aneurysmal bone cyst, and simple bone cyst. Some of those lesions are discovered accidentally during radiological investigation for other purposes. However many of these lesions may present with pain, limbing and pathological fracture.
In planning for the management of such lesions, three important points should be considered: first, to prevent deformity and pathological fracture; second, control the biological behavior of the disease; and third, post management protection of the proximal femur either externally by a spica cast or internally by osteosynthesis.
Treatment of these lesions usually entails curettage, with or without the use of adjuvants to control local recurrence of some lesions. The resultant defect could be left to heal without refilling or it is filled with autogenous, allogenic, or synthetic bone graft with or without osteosynthesis.