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Cytomegalovirus endolabyrinthitis.

G L Davis, G J Spector, M Strauss

    Archives of Pathology & Laboratory Medicine
    |March 1, 1977
    PubMed
    Summary
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    Cytomegalovirus (CMV) infection in premature infants can cause endolymphatic labyrinthitis, affecting the inner ear's non-neural structures. This study reveals CMV targets the endolymphatic spaces, differing from other viral labyrinthitis patterns.

    Area of Science:

    • Otolaryngology
    • Virology
    • Neonatal Pathology

    Background:

    • Cytomegalovirus (CMV) is a common congenital infection with potential long-term sequelae.
    • The specific mechanisms of CMV-induced inner ear damage, particularly in neonates, require further elucidation.
    • Understanding viral tropism in the inner ear is crucial for diagnosing and managing congenital infections.

    Observation:

    • A premature infant diagnosed with cytomegalic inclusion disease exhibited hyaline membrane disease and expired 22 days post-birth.
    • Histopathological analysis of the temporal bones revealed widespread cytomegalovirus (CMV) infection confined to the endolabyrinth.
    • Notably, the neural and sensory components of the inner ear remained uninvolved by the CMV infection.

    Findings:

    • The observed pattern of CMV infection supports the hypothesis of late gestational or perinatal fetal CMV infection leading to endolymphatic labyrinthitis.

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  • It is hypothesized that the blood-borne virus disseminates from the stria vascularis into the endolymphatic spaces.
  • The virus subsequently infects the non-neurosensory epithelium within the endolymphatic labyrinth.

    • Implications:

    • This distinct pattern of endolabyrinthine infection by CMV differentiates it from the perilabyrinthitis seen in human varicella-zoster virus infections or experimental mouse CMV models.
    • Findings suggest CMV may preferentially target the non-neurosensory structures of the inner ear, potentially preserving hearing and balance function if the infection is limited.
    • Further research into the pathogenesis of congenital CMV labyrinthitis is warranted to develop targeted diagnostic and therapeutic strategies.