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Aneurysmal bone cyst in FD. Aneurysmal bone cysts are uncommonly associated with fibrous dysplasia. a The radiograph demonstrated disruption of the cortex. b MRI imaging revealed a clear-cut fluid-fluid level (arrows), consistent with an aneurysmal bone cyst. These lesions can be aggressive, eroding bone as shown by the loss of the cortex in a and b, and bleed extensively. Adequate blood should be obtained if surgical intervention is planned
