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Related Experiment Videos

The frontal sinus and the ethmoidal labyrinth

I Vinter1, J Krmpotic-Nemanic, J Hat

  • 1Institute for Roentgenology, General Hospital Sestre Milosrdnice, Zagreb, Croatia.

Surgical and Radiologic Anatomy : SRA
|January 1, 1997
PubMed
Summary

The frontal bone often fails to cover ethmoidal cells, posing risks during ethmoidectomy surgery. Anatomical variations in skull development highlight potential surgical dangers beyond the lamina cribrosa.

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Area of Science:

  • Anatomy
  • Surgical Anatomy
  • Craniofacial Development

Background:

  • The standard anatomical description posits the frontal bone and cribriform plate form the anterior cranial fossa base.
  • Variations in this anatomy may impact surgical procedures like ethmoidectomy.

Purpose of the Study:

  • To investigate the developmental relationship between the ethmoidal bone and frontal bone.
  • To identify anatomical variations relevant to ethmoidectomy risks.

Main Methods:

  • Examination of macerated disarticulated skull bones and skull bases from 35 individuals aged 9–35 years.
  • Analysis of the extent to which the frontal bone covers ethmoidal cells.

Main Results:

  • In 19 of 35 cases, ethmoidal cells were partially or completely uncovered by the frontal bone.

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  • The degree of frontal bone coverage varied, with some cases showing no coverage and others covering anterior or anterior and middle ethmoidal cells.
  • A rare finding in a 60-year-old subject showed ethmoidal cells incorporated into the anterior cranial fossa base.

    • Conclusions:

    • Uncovered ethmoidal cells present a significant risk during ethmoidectomy, even when operating lateral to the middle concha insertion.
    • Discrepancies between literature and findings may stem from imprecise age data in previous anatomical descriptions.
    • Surgical planning for ethmoidectomy should consider potential anatomical variations in frontal bone coverage of ethmoidal cells.