Aneurysmal bone cyst

RG Schmidt Musculoskeletal Tumor Center, Philadelphia.

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YM Kabbani Musculoskeletal Tumor Center, Philadelphia.

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DP Mayer Musculoskeletal Tumor Center, Philadelphia.

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Key findings that aid in the diagnosis of an aneurysmal bone cyst are: 1) typically the patients are young individuals less than 20 years old; 2) an expansile bone lesion is bordered by a thin, low signal intensity rim mass; 3) the lesion is inhomogenously increased in signal on T2-weighted images; and 4) multiple fluid-fluid levels are seen with the mass on T2-weighted magnetic resonance imaging scans.

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