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Sinus tympani endoscopic anatomy.

Fatthi Abdel Baki1, Mohammed Badr El Dine, Ibrahim El Saiid

  • 1Department of Otolaryngology, Alexandria Faculty of Medicine, Egypt. fatthibaki@cns-egypt.com

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|September 26, 2002
PubMed
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This study details the microscopic and endoscopic anatomy of the sinus tympani, a difficult surgical area. Findings highlight the need to remove a lateral bone lip and use a 30-degree endoscope for better visualization.

Area of Science:

  • Otolaryngology
  • Surgical Anatomy

Background:

  • The sinus tympani presents surgical challenges due to cholesteatoma invasion, poor visibility, and difficult access.
  • Understanding its anatomy is crucial for effective surgical management.

Purpose of the Study:

  • To describe the microscopic and endoscopic anatomy of the sinus tympani.
  • To identify anatomical landmarks and variations relevant to surgical approaches.

Main Methods:

  • Dissection of 30 human cadaver temporal bones using an operating microscope.
  • Endoscopic visualization with angled telescopes (30-70 degrees) and video imaging.
  • Precise measurements using digital image processing.

Main Results:

  • Significant variations in sinus tympani size and shape were observed.

Related Experiment Videos

  • A constant bony ledge lateral to the facial nerve was identified.
  • The sinus tympani was found to extend posteriorly to the facial nerve in some specimens.
  • Angled endoscopes provided clear visualization of the sinus tympani region.

    • Conclusions:

    • Removal of the lateral bony lip is essential for exposing the sinus tympani orifice.
    • A 30-degree endoscope is recommended for optimal visualization and cleaning of the sinus tympani.
    • Endoscopic techniques improve surgical access to this challenging anatomical space.