Temporal bone study of trisomy 13 syndrome.
Hisaki Fukushima1, Patricia A Schachern, Sebahattin Cureoglu
1Department of Otolaryngology, University of Minnesota, Minneapolis, MN, USA.
The Laryngoscope
|December 20, 2007
Summary
This study examined the temporal bones of an infant with trisomy 13 syndrome, revealing significant abnormalities in the cochlear and vestibular nerves, contributing to congenital hearing loss.
Area of Science:
- Otopathology
- Developmental Biology
- Genetics
Background:
- Trisomy 13 syndrome is a genetic disorder associated with multiple congenital anomalies.
- Bilateral hearing loss is a common manifestation in infants with trisomy 13.
- Microscopic evaluation of temporal bone structures is crucial for understanding auditory and vestibular deficits.
Observation:
- Microscopic analysis of the temporal bones from a 23-week-old female with trisomy 13 syndrome was performed.
- The left cochlea showed complete absence of spiral ganglion cells and cochlear nerve fibers.
- The right ear exhibited an aberrant singular nerve branch impacting the utricle and lateral semicircular canals.
Findings:
- Absence of cochlear nerve and spiral ganglion cells in the left ear.
- Anomalous vestibular nerve branching pattern observed in the right ear, affecting the vestibular apparatus.
- Pathological changes identified in the facial, vestibular, and cochlear nerves.
Implications:
- This case highlights the complex neuro-otological impact of trisomy 13 syndrome.
- Understanding these nerve abnormalities can inform audiology and otolaryngology practices for affected infants.
- Further research into the genetic and developmental mechanisms underlying these otic abnormalities is warranted.
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