title: Intrapetrous epidermoid deforming the pantopaque cisternogram.
abstract: Pantopaque cisternography is now an established procedure for the diagnosis of mass lesions arising in, or extending into the cerebellopontine angle. Non-filling of the internal auditory canal, even if of normal dimensions, is, with rare exceptions, diagnostic of an intracanalicular acoustic neurinoma. A case is reported of an intrapetrous epidermoid excavating the internal ear, but not widening the meatus, which prevented filling of the canal at cisternography.
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000000981:diagnostic imaging*; D002530:Cerebellopontine Angle; D004814:Epidermal Cyst / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007462:Iodobenzenes; D007481:Iophendylate; D011011:Pneumoencephalography
chemical_list: D007462:Iodobenzenes; D007481:Iophendylate