Bilateral Primary Aneurysmal Bone Cyst of Proximal Femur: A Rare Case Report

Abstract

Aneurysmal bone cysts (ABC) are blood-filled, locally destructive, expansile lesions of the bone. ABC of the proximal femur is usually unilateral in presentation. As far as the English literature is concerned, there is no case report of bilateral involvement of the proximal femur by primary ABC. We hereby present a rare case of bilateral primary ABC of the proximal femur with pathological fracture of the right femoral neck. The patient underwent right hip hemiarthroplasty and open biopsy and curettage of the left proximal femur. ABC is usually unilateral in location. Whenever there is a bilateral lesion in the proximal femur usually ABC is not suspected as a differential diagnosis, but ABC may have a bilateral presentation.