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Temporal bone pathology in hydrocephalus: changes in the inner ear due to increased intracranial pressure

Masaki Sano1, Kimitaka Kaga, Toshihiro Tsuzuku

  • 1Department of Otorhinolaryngology and Head and Neck Surgery, Faculty of Medicine, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan. gakutaikyo@yahoo.co.jp

International Journal of Pediatric Otorhinolaryngology
|April 15, 2004
PubMed

Insights

Increased intracranial pressure causes inner ear damage, starting in the cochlea's base. This study examined a child's temporal bone, revealing specific changes due to hydrocephalus.

Area of Science:

  • Otorhinolaryngology
  • Neurology
  • Pathology

Background:

  • Inner ear changes from increased intracranial pressure (ICP) are not well understood.
  • Hydrocephalus, a condition of excess cerebrospinal fluid, can elevate ICP.
  • This study investigates the effects of ICP on the inner ear structures.

Observation:

  • A postmortem temporal bone from a 2-year-old female with IVth ventricle ependymoblastoma and hydrocephalus was analyzed.
  • The cochlea's basal turn showed degeneration of the organ of Corti and nerve ganglion.
  • The apical and middle turns of the cochlea, utricle, and saccule remained intact.

Findings:

  • Degeneration in the inner ear due to elevated ICP appears to initiate at the cochlea's base.
  • The extent of damage decreases from the cochlear base towards the apex.
  • The organ of Corti and spiral ganglion are vulnerable to ICP-induced changes.

Implications:

  • Understanding the pattern of inner ear damage can aid in diagnosing and managing hearing loss in pediatric hydrocephalus.
  • This research provides a basis for further studies on ICP's ototoxic effects.
  • The findings highlight the importance of considering neurological conditions in audiovestibular assessments.

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