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The epidermoid formation (Michaels' structure) in the developing middle ear.

R G Wang1, M Hawke, P Kwok

  • 1Department of Otolaryngology, University of Toronto, Ontario.

The Journal of Otolaryngology
|December 1, 1987
PubMed
Summary

Researchers confirmed Michaels

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Area of Science:

  • Otolaryngology
  • Developmental Biology
  • Pathology

Background:

  • An epidermoid-like formation in the developing middle ear was first described by Michaels in 1986.
  • The exact incidence and significance of this structure remain areas for further investigation.

Purpose of the Study:

  • To confirm the existence of the epidermoid-like formation described by Michaels.
  • To investigate the incidence of this structure in a fetal specimen collection.
  • To discuss the potential role of this structure in congenital cholesteatoma.

Main Methods:

  • Review of 41 middle ears from 20 serially sectioned fetal heads.
  • Examination of one fetal temporal bone.
  • Identification and documentation of epidermoid formations.

Main Results:

  • Six epidermoid formations were identified in the reviewed specimens.
  • The study confirms the existence of the structure, now named Michaels' structure.
  • Incidence differed from Michaels' original report, prompting further discussion.

Conclusions:

  • Michaels' structure is a confirmed finding in the developing middle ear.
  • The study provides data on its incidence and discusses its potential role in congenital cholesteatoma pathogenesis.

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