Department of Orthopedic Surgery, McGill University Health Centre, Montreal, Quebec, Canada.
JBJS Case Connect. 2020 Apr-Jun;10(2):e0493. doi: 10.2106/JBJS.CC.18.00493.
A 59-year-old man presented with a history of a painful, rapidly growing mass on the anteromedial aspect of his thigh. On examination, he had a mobile, hard, and nontender mass. Magnetic resonance imaging revealed a well-encapsulated, heterogeneous mass with high-intensity internal septations. Blood-filled spaces were observed within the mass with no involvement of the underlying normal bony structures. The mass was excised, and the diagnosis of an extraosseous aneurysmal bone cyst was confirmed histologically.
Extraosseous aneurysmal bone cysts are rare benign lesions that can mimic malignant tumors. Careful clinical and pathological assessment should be performed in such cases.
一名 59 岁男性，大腿前内侧出现疼痛、快速生长的肿块。体格检查发现，肿块可移动，质地硬，无触痛。磁共振成像显示，肿块包膜完整，呈不均匀高密度，内部可见分隔。肿块内可见含血腔隙，但未累及下方正常骨结构。肿块被切除，组织学诊断为骨外动脉瘤样骨囊肿。
骨外动脉瘤样骨囊肿是一种罕见的良性病变，可能与恶性肿瘤相混淆。对于此类病例，应进行仔细的临床和病理评估。
