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Residual mesenchyme persisting into adulthood.

V J Jaisinghani1, M M Paparella, P A Schachern

  • 1Department of Otolaryngology, University of Minnesota School of Medicine, Minneapolis, USA.

American Journal of Otolaryngology
|December 28, 1999
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Summary

Residual mesenchyme, a developmental tissue, can persist in adult temporal bones, particularly in mastoid air cells. Its presence is linked to otitis media, suggesting a role in middle ear pathology.

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Area of Science:

  • Otorhinolaryngology
  • Developmental Biology
  • Histopathology

Background:

  • Mesenchyme is embryonic connective tissue that typically regresses after development.
  • Understanding its persistence in adults is crucial for diagnosing ear pathologies.

Observation:

  • Residual mesenchyme was identified in 2.07% of adult temporal bones (ages 5-81).
  • Transitional mesenchyme was more common (92.1%) than pure mesenchyme (7.9%).
  • Persistence was noted in mastoid air cells (76%) and round window niche.

Findings:

  • No age-related regression pattern was observed in individuals over 5 years old.
  • A strong association was found between residual mesenchyme and otitis media (84.2%).

Implications:

  • Residual mesenchyme can persist into adulthood, particularly in the mastoid air cells.
  • Persistent mesenchyme may be a significant factor in the development or progression of otitis media.