title: Intradural lumbar disk fragment with ring enhancement on MR.
abstract: Intradural extension of a herniated intervertebral disk, an unusual complication of a common disease, may mimic an intradural tumor on MR. A case of a pathologically proved subdural disk fragment is presented; MR findings that suggested the correct diagnosis were: proximity of intervertebral disk disease; whorl-like mixed intensity on T2-weighted images; poor visualization of the mass on unenhanced T1-weighted images; and marked ring enhancement following administration of gadolinium.
authors.affiliation: Department of Radiology, Milton S. Hershey Medical Center, Pennsylvania State University Hospital, Hershey 17033.
authors.forename: R
authors.initials: R
authors.lastname: Wasserstrom
authors.forename: A C
authors.initials: AC
authors.lastname: Mamourian
authors.forename: J F
authors.initials: JF
authors.lastname: Black
authors.forename: R A
authors.initials: RA
authors.lastname: Lehman
mesh_terms: D003937:Diagnosis, Differential; D004388:Dura Mater / Q000473:pathology*; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000175:diagnosis* / Q000473:pathology; D008159:Lumbar Vertebrae / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D013120:Spinal Cord Neoplasms / Q000175:diagnosis