title: MR imaging of a hemorrhagic and granulomatous cyst of the ligamentum flavum with pathologic correlation.
abstract: Cysts of the ligamentum flavum are uncommon causes of neurologic signs and symptoms and usually are seen in persons over 50 years of age. We report a case of an epidural cyst located in the ligamentum flavum, which contributed to spinal stenosis in a 30-year-old man. Radiologic features were similar to those of a synovial cyst, but synovium was not identified histologically. The imaging and pathologic features were unusual, including hemorrhage and a fibrohistiocytic reaction with giant cells.
authors.affiliation: Department of Diagnostic Imaging, Foothills Hospital, Alberta, Canada.
authors.forename: H
authors.initials: H
authors.lastname: Mahallati
authors.forename: C J
authors.initials: CJ
authors.lastname: Wallace
authors.forename: K M
authors.initials: KM
authors.lastname: Hunter
authors.forename: J M
authors.initials: JM
authors.lastname: Bilbao
authors.forename: A W
authors.initials: AW
authors.lastname: Clark
mesh_terms: D000328:Adult; D003560:Cysts / Q000150:complications / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D006099:Granuloma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D006470:Hemorrhage / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D006801:Humans; D017843:Ligamentum Flavum / Q000473:pathology* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D009140:Musculoskeletal Diseases / Q000150:complications / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D013130:Spinal Stenosis / Q000175:diagnosis / Q000209:etiology