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Laryngoscope Investig Otolaryngol. 2020 Jan 13;5(1):157-162. doi: 10.1002/lio2.347. eCollection 2020 Feb.

Otopathology in CHARGE syndrome.

Author information

1
Department of Otolaryngology Harvard Medical School Boston Massachusetts.
2
Department of Radiology Massachusetts Eye and Ear Boston Massachusetts.
3
Otopathology Laboratory Massachusetts Eye and Ear Boston Massachusetts.

Abstract

Postmortem temporal bone computed tomography (CT) and histopathologic findings in an infant with CHARGE syndrome revealed bilateral cochleovestibular hypoplasia, including cochlear pathology relevant to cochlear implant candidacy. Both ears had absence of the superior semicircular canals (SCCs), severely hypoplastic posterior SCCs, and hypoplastic (right ear) or absent (left ear) lateral SCCs seen on CT and histopathology. Histopathology further revealed the absence of all SCC ampullae except the right lateral SCC ampulla and atrophic vestibular neuroepithelium in the saccule and utricle bilaterally. The right cochlea consisted of a basal turn with patent round window, and malformed middle turn (type IV cochlear hypoplasia), with a small internal auditory canal (IAC) but near normal cochlear nerve aperture (fossette). Quantification of spiral ganglion neurons (SGNs) on histologic sections revealed a reduced SGN population (35% of normal for age), but this ear would still have likely achieved benefit from a cochlear implant based on this population. The left cochlea consisted of only a basal turn with patent round window (type III cochlear hypoplasia) with a small IAC and very small cochlear nerve aperture. Notably, histology revealed that there were no SGNs in the cochlea, and therefore, this ear would not have been a good candidate for cochlear implantation.

KEYWORDS:

CHARGE syndrome; cochlear implantation; congenital anomalies; otopathology; temporal bone pathology

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