title: [Histiocytosis X of the petrous pyramid in adults. X-ray computed tomographic and MRI aspects].
abstract: Two cases are reported of histiocytosis X in young adults, both confined to the petrous bone. In one case the clinical signs were those of a progressive facial palsy, developing over 3 years; the other case had pulsatile tinnitus with clear otorrhoea and symptoms of vestibular deficiency. Computed tomography showed extensive bone destruction by a soft-tissue density process which enhanced strongly after iodinated contrast injection. Magnetic resonance imaging (T1 weighted sequences before and after intravenous gadolinium injection) confirmed the presence of a mass lesion in the petrous bone with contrast medium uptake which showed cystic areas within it: it also showed the absence of extension through the dura mater by the intracranial component which remained extradural. It confirmed the patency of arteries and veins, so enabling a differentiation to be made between histiocytosis X and advanced glomus tumours.
authors.affiliation: Service de Neuroradiologie, Hôpital Purpan, Toulouse.
authors.forename: P
authors.initials: P
authors.lastname: Jaeger
authors.forename: A
authors.initials: A
authors.lastname: Bonafe
authors.forename: B
authors.initials: B
authors.lastname: Fraysse
authors.forename: C
authors.initials: C
authors.lastname: Manelfe
mesh_terms: D000293:Adolescent; D000328:Adult; D006646:Histiocytosis, Langerhans-Cell / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010579:Petrous Bone; D012888:Skull Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D014057:Tomography, X-Ray Computed
vernacular_title: Histiocytose X de la pyramide pétreuse de l'adulte. Aspects tomodensitométriques et IRM.