Precision Analysis of Supraorbital Transcranial Exits Using Three Dimensional Multidetector Computed Tomography

Area of Science:

• Anatomy
• Radiology
• Skull base anatomy

Background:

• Supraorbital transcranial exits exhibit anatomical variations.
• Previous studies used inconsistent criteria for classifying these exits.
• Need for a standardized classification system is evident.

Purpose of the Study:

• To analyze variations in supraorbital transcranial exits using 3D MDCT.
• To present a consistent classification of exit types.
• To provide precise location measurements of these anatomical variations.

Main Methods:

• Utilized 3D multidetector computed tomography (3D MDCT) in 1181 patients (2362 orbits).
• Assessed qualitative parameters: location, type, and accessory foramina.
• Measured quantitative parameters including distances from anatomical landmarks.

Main Results:

• Frontal exits were present in 2071 orbits; supraorbital exits in 953.
• The frontal notch was the most frequent type of frontal exit.
• Mean distance from nasion to frontal exit: 24.70 mm (right) and 23.69 mm (left).

Conclusions:

• Various supraorbital transcranial exit types were identified.
• The frontal notch represents the most common type.
• This study provides a consistent classification and distribution analysis of these exit types in a large sample.