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Related Experiment Video

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Middle ear morphology and mastoid pneumatisation: a computed tomography study.

Bernardo Alfonso Fernández-Reyes1, Santos Guzman-Lopez1, Francisco Javier Arrambide-Garza1

  • 1Universidad Autónoma de Nuevo León, School of Medicine, Human Anatomy Department, Monterrey, Nuevo León, México.

Folia Morphologica
|June 6, 2024
PubMed
Summary

Men exhibit greater mastoid pneumatisation than women, with differences observed in mastoid air cell system (MACS) volume. Eustachian tube length did not significantly impact mastoid air cell system pneumatisation.

Keywords:
Eustachian tubeaditus ad antrumanatomymastoid air cell systemmiddle ear

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Area of Science:

  • Otolaryngology
  • Radiology
  • Human Anatomy

Background:

  • Mastoid pneumatisation is influenced by factors like race, sex, and adjacent middle ear structures.
  • Understanding these influences is crucial for interpreting middle ear conditions.

Purpose of the Study:

  • To determine mastoid air cell system (MACS) volume.
  • To investigate the relationship between MACS volume and middle ear structures.
  • To assess the influence of sex on MACS volume and Eustachian tube length (ETL).

Main Methods:

  • A cross-sectional study analyzed 100 computed tomography (CT) scans.
  • Measurements included MACS volume, ETL, and aditus ad antrum dimensions.
  • Statistical analysis was performed to identify correlations and sex-based differences.

Main Results:

  • Mean MACS volume was 5.43 cm³ (right) and 5.54 cm³ (left).
  • Mean ETL was 24.55 mm (right) and 24.24 mm (left).
  • Significant differences in MACS volume and left ETL were found between sexes; a low positive correlation existed between aditus ad antrum height and MACS volume.

Conclusions:

  • Mastoid pneumatisation is greater in men than in women.
  • A low positive correlation was noted between mastoid volume and ETL, and right mastoid volume and aditus ad antrum height.
  • Eustachian tube length does not appear to significantly affect mastoid air cell system pneumatisation.