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Large centric expansile lytic lesion in the proximal metaphysis to the mid-diaphysis of the left humerus. It has multiple internal septations, cortical thinning, and mild bowing deformity. There is a healing pathologic fracture along the medial cortex of the lesion. The differential diagnosis includes aneurysmal bone cyst, fibrous dysplasia, unicameral bone cyst, or eosinophilic granuloma.