title: Cervical thorium dioxide granuloma ('thorotrastoma').
abstract: An elderly woman had an expanding cervical mass that entrapped and compressed the adjacent cranial nerves, blood vessels, and muscles. The mass was dense on radiographs, extended from the skull base to low neck in the prevertebral and parapharyngeal tissues, and showed mixed intensity on MR. A previous direct carotid arteriogram with thorium dioxide as the contrast agent suggested the histologically proved diagnosis of a cervical thorium dioxide granuloma ("thorotrastoma").
authors.affiliation: Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia 19104, USA.
authors.forename: B T
authors.initials: BT
authors.lastname: Nguyen
authors.forename: D M
authors.initials: DM
authors.lastname: Yousem
authors.forename: R E
authors.initials: RE
authors.lastname: Hayden
authors.forename: K T
authors.initials: KT
authors.lastname: Montone
mesh_terms: D003937:Diagnosis, Differential; D003952:Diagnostic Imaging; D005260:Female; D005549:Foreign-Body Reaction / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D015745:Granuloma, Foreign-Body / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D006801:Humans; D008875:Middle Aged; D009333:Neck / Q000473:pathology / Q000601:surgery; D013911:Thorium Dioxide
chemical_list: D013911:Thorium Dioxide