title: Aneurysmal bone cyst.
abstract: 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.
authors.affiliation: Musculoskeletal Tumor Center, Philadelphia.
authors.forename: R G
authors.initials: RG
authors.lastname: Schmidt
authors.forename: Y M
authors.initials: YM
authors.lastname: Kabbani
authors.forename: D P
authors.initials: DP
authors.lastname: Mayer
mesh_terms: D000328:Adult; D017824:Bone Cysts, Aneurysmal / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging; D001859:Bone Neoplasms / Q000150:complications; D002111:Calcaneus / Q000000981:diagnostic imaging; D018212:Giant Cell Tumor of Bone / Q000150:complications; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D011877:Radionuclide Imaging; D014057:Tomography, X-Ray Computed