“Onion bulb” formation associated with a solitary neoplasm of the eighth nerve sheath

Audiometric patterns associated with retrocochlear disorders include abnormal adaptation, delay of auditory evoked potential latencies, and characteristic abnormalities of speech intelligibility functions. The anatomic substrate of these psychoacoustic and electrophysiologic abnormalities is unknown...

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Veröffentlicht in:American journal of otolaryngology 1981-11, Vol.2 (4), p.307-313
Hauptverfasser: Gail Neely, J., Armstrong, Dawna, Benson, John, Neblett, Charles
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container_title American journal of otolaryngology
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creator Gail Neely, J.
Armstrong, Dawna
Benson, John
Neblett, Charles
description Audiometric patterns associated with retrocochlear disorders include abnormal adaptation, delay of auditory evoked potential latencies, and characteristic abnormalities of speech intelligibility functions. The anatomic substrate of these psychoacoustic and electrophysiologic abnormalities is unknown. This paper describes the incidental observation of “onion bulbs” in a solitary neoplasm involving the eighth nerve sheath and in the cochlear nerve lateral to the neoplasm. Such hypertrophic neuropathy in the eight nerve has not been described previously. This occurrence raises the question of sequential demyelination and remyelination in a neoplasm-bearing nerve as a possible histopathologic correlate to retrocochlear dysfunction.
doi_str_mv 10.1016/S0196-0709(81)80040-3
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subjects Cranial Nerve Neoplasms - pathology
Cranial Nerve Neoplasms - ultrastructure
Humans
Male
Microscopy, Electron
Middle Aged
Neurilemmoma - pathology
Neurilemmoma - surgery
Neurofibroma - pathology
Neurofibroma - surgery
Vestibulocochlear Nerve Diseases - pathology
Vestibulocochlear Nerve Diseases - surgery
title “Onion bulb” formation associated with a solitary neoplasm of the eighth nerve sheath
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