Gas computed tomographic cisternography: Evaluation of small and intracanalicular acoustic neuromas

Exostosis of the internal auditory canal

“…We add our own case to the few described by others (Debain et al, 1965;Moos and Steinbrigge, 1982;Smelt, 1984). The diagnosis has been made by temporal bone polytomography (Pagani et al 1980), computed tomography, and gas computed tomographic cisternography (Oliver et al, 1984). The differential diagnosis of the internal auditory canal stenosis is discussed.…”

“…The differential diagnosis includes intracanalicular acoustic neuroma, Paget's disease, fibrous dysplasia, congenital malformation of the inner ear, otosclerosis, and vitamin A deficiency. The intracanalicular acoustic neuroma usually erodes the porus acusticus or the bone distal to it (Oliver et al, 1984). The absence of generalized bone involvement or increased serum alkaline phosphatase can eliminate Paget's disease from the diagnosis (Applebaum and Clemis, 1977;Edelken, 1981;Griffey, 1960;Nager, 1975;Proope etal., 1985).…”