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Temporal bone histopathology in deafness due to cryptococcal meningitis
The Annals of Otology, Rhinology, and Laryngology
|September 1, 1979
Summary
Cryptococcal meningitis can cause lasting hearing loss by damaging the cochlear nerve. Histopathology revealed significant nerve fiber loss in the inner ear, confirming this link.
Area of Science:
- Neurology
- Otolaryngology
- Infectious Diseases
Background:
- Cryptococcal meningitis is a serious fungal infection, particularly affecting immunocompromised individuals.
- Long-term complications, such as hearing loss, can occur after recovery from cryptococcal meningitis.
Observation:
- A patient who survived cryptococcal meningitis eight years prior presented with bilateral sensorineural hearing loss.
- Histopathologic examination of temporal bones revealed severe loss of spiral ganglion cells and cochlear nerve fibers.
Findings:
- The pathology primarily affected the cochlear nerve within the internal auditory meatus and modiolus.
- The vestibular nerve showed minimal pathology, suggesting selective vulnerability.
- While the organ of Corti was atrophic, hair cell populations were largely preserved.
Implications:
- This case highlights the cochlear nerve as a primary target in cryptococcal infections of the temporal bone.
- Findings correlate histopathologic damage with audiologic evidence of retrocochlear lesions.
- Understanding these mechanisms is crucial for managing hearing deficits post-meningitis.