internal acoustic meatus

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internal acoustic meatus

[in′tərn·əl ə′kü·stik mē′ād·əs]
(anatomy)
An opening in the hard portion of the temporal bone for passage of the facial and acoustic nerves and internal auditory vessels.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
(b) Contrast showing an enhancing lesion in the internal auditory meatus involving the 7th-8th nerve complex most likely acoustic neuroma (red circle).
Congenital hearing loss can be accompanied by radiologically demonstrable bony inner ear abnormalities associated with narrow internal auditory meatus. Most reports in the literature about dilated internal auditory meatus refer to expansion secondary to an acoustic neuroma or other occupying lesion.
The patient subsequently died of carcinomatosis and a limited post-mortem examination unexpectedly revealed bilateral metastatic adenocarcinoma infiltrating the internal auditory meatus and the acoustic nerves (figure 3).
(2) Prat and Gray reported 1 case of extension along the facial nerve and through the internal auditory meatus that culminated in encasement of the base of the brain and entire spinal cord (massive neuraxial spread); there was no systemic metastasis.
Intracranial neurilemmomas, such as acoustic neuromas, may develop within the internal auditory meatus and compress the VIIIth cranial nerve, leading to symptoms such as deafness and tinnitus.
Positive contrast demonstration of a cerebrospinal fluid fistula through the fundus of the internal auditory meatus. Acta Radiol Diagn (Stockh) 1969;9:83-90.
Approximately 10% of all intracranial tumors are located in the internal auditory meatus (IAM) and the cerebellopontine angle (CPA).