title: Foreign body giant cell reaction associated with epidermoid tumor: CT and MR findings.
abstract: A patient with a known epidermoid tumor presented with a new large ring-enhancing mass adjacent to the cyst. Histopathology showed foreign body giant cell reaction adjacent to the epidermoid cyst. The CT and MR imaging appearances are described. The neuroimaging findings are identical to malignant degeneration to squamous cell carcinoma.
authors.affiliation: Department of Radiology, Indiana University School of Medicine, University Hospital, Indianapolis 46202-5253, USA.
authors.forename: C C
authors.initials: CC
authors.lastname: Moran
authors.forename: S T
authors.initials: ST
authors.lastname: Vakili
authors.forename: K S
authors.initials: KS
authors.lastname: Caldemeyer
authors.forename: R R
authors.initials: RR
authors.lastname: Smith
mesh_terms: D000368:Aged; D001921:Brain / Q000473:pathology; D002526:Cerebellar Diseases / Q000175:diagnosis / Q000473:pathology; D002530:Cerebellopontine Angle; D004814:Epidermal Cyst / Q000175:diagnosis* / Q000473:pathology; D005549:Foreign-Body Reaction / Q000175:diagnosis* / Q000209:etiology / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D014057:Tomography, X-Ray Computed