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Plain radiograph of the pelvis of a man, 24 years of age, showing a large, expansile osteolytic lesion and a soft-tissue mass involving the right proximal femur. A diagnosis of aneurysmal bone cyst was made after biopsy of the lesion (Reproduced with permission. In: Peter Renton, ed. Orthopaedic Radiology: Pattern Recognition and Differential Diagnosis. 1st Ed. London, UK: Martin Dunitz Ltd.; 1990. Figure 3.43b, p. 170. Copyright 1990 Taylor & Francis. All rights reserved).
