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.
Case Rep Orthop Res 2021;4:217–223

中文翻译：

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双侧股骨近端原发性动脉瘤性骨囊肿：罕见病例报告

动脉瘤性骨囊肿 (ABC) 是充满血液的、局部破坏性的、可扩张的骨骼病变。股骨近端 ABC 的表现通常是单侧的。就英文文献而言，尚无原发性 ABC 双侧股骨近端受累的病例报告。我们在此介绍一例罕见的双侧股骨近端 ABC 伴右侧股骨颈病理性骨折的病例。患者接受了右髋半关节置换术和左股骨近端的开放活检和刮除术。ABC 在位置上通常是单边的。每当股骨近端有双侧病变时，通常不怀疑 ABC 作为鉴别诊断，但 ABC 可能有双侧表现。
案例代表 Orthop Res 2021；4:217–223