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Pneumatisation patterns surrounding the internal acoustic meatus.

Răzvan Costin Tudose1, George Triantafyllou2, Maria Piagkou2

  • 1Division of Anatomy, Department 1, Faculty of Dentistry, "Carol Davila" University of Medicine and Pharmacy, Bucharest 050474, Romania; Research Department, "Dr. Carol Davila" Central Military Emergency Hospital, Bucharest 010825, Romania; Center of Innovation and e-Health, "Carol Davila" University of Medicine and Pharmacy, Bucharest 020021, Romania.

Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft
|September 6, 2025
PubMed
Summary
This summary is machine-generated.

Temporal bone pneumatization around the internal acoustic meatus (IAM) most frequently affects the superior wall. This pneumatization is linked to increased tegmen thickness, crucial for surgical planning.

Keywords:
Cone-beam computed tomographyInternal acoustic meatusTegmen thicknessTemporal bone pneumatisationVestibular schwannoma

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Area of Science:

  • Otorhinolaryngology
  • Neurosurgery
  • Radiology

Background:

  • Temporal bone pneumatization is a common anatomical variation.
  • Understanding pneumatization patterns around the internal acoustic meatus (IAM) is vital for skull base surgery.
  • Previous studies have not comprehensively detailed IAM-adjacent pneumatization across its distinct regions.

Purpose of the Study:

  • To determine the prevalence and anatomical distribution of temporal bone pneumatization surrounding the internal acoustic meatus (IAM).
  • To assess pneumatization in the porus acusticus internus, proper IAM, and fundus.
  • To investigate the relationship between IAM-adjacent pneumatization and overlying tegmen thickness.

Main Methods:

  • Cone-beam computed tomography (CBCT) analysis of 160 internal acoustic meatuses (IAMs) from 80 patients.
  • Subdivision of the IAM into medial (porus), mid (proper IAM), and lateral (fundus) portions.
  • Assessment of pneumatization on superior, inferior, anterior, and posterior walls, with tegmen thickness measurements.

Main Results:

  • Superior wall pneumatization was observed in approximately 23% of sides.
  • Inferior wall pneumatization was absent in over 50% of cases; posterior wall pneumatization was largely absent.
  • Pneumatized regions exhibited significantly greater tegmen thickness (p < 0.001).

Conclusions:

  • Temporal bone pneumatization adjacent to the IAM predominantly involves the superior wall.
  • Increased tegmen thickness is associated with IAM-adjacent pneumatization.
  • Findings enhance understanding for safer skull base surgical approaches and neurotological procedures.