[CT scan of frontal recess]

Area of Science:

• Otolaryngology
• Medical Imaging
• Anatomy

Background:

• Nasal endoscopic frontal sinus operations require precise anatomical understanding.
• The frontal recess is a complex area crucial for sinus drainage.

Purpose of the Study:

• To create 3-D reconstructions of the frontal recess using high-speed spiral CT.
• To assess the utility of these reconstructions for nasal endoscopic frontal sinus surgery.

Main Methods:

• Fifty-one cases underwent 16-line high-speed spiral CT for frontal recess 3-D reconstruction.
• Structures including the agger nasi and uncinate process were identified and measured.
• Data from chronic frontal sinusitis patients and normal controls were compared.

Main Results:

• 3-D CT reconstruction visualized the frontal sinus, endosome, and recess.
• Frontal recess shape variability was linked to adjacent structures like the agger nasi.
• Significant differences in inner diameter were noted between the agger nasi and frontal endosome.

Conclusions:

• Frontal recess drainage is influenced by the agger nasi and uncinate process.
• The agger nasi serves as a consistent anatomical landmark for frontal sinus surgery.
• CT 3-D reconstruction of the frontal recess enhances surgical safety by identifying critical areas.