Three-dimensional anatomic analysis of retrosigmoid approach with thin-section computed tomographic image

Area of Science:

• Neurosurgery
• Anatomy
• Medical Imaging

Background:

• The retrosigmoid approach is crucial for accessing posterior fossa pathologies.
• Precise anatomical knowledge is vital for safe surgical navigation.
• Minimizing iatrogenic injury to neural and vascular structures is a primary surgical goal.

Purpose of the Study:

• To precisely measure distances between critical anatomical landmarks relevant to the retrosigmoid approach.
• To utilize advanced imaging techniques for accurate spatial assessment.
• To provide quantitative data to enhance surgical planning and safety.

Main Methods:

• Acquisition of thin-section computed tomographic (CT) images from 120 volunteers.
• Three-dimensional (3D) reconstruction of cranial anatomy.
• Volume-rendering technique applied for detailed visualization and measurement.

Main Results:

• The distance between anatomical landmarks AC was 39.46 mm (±4.22 mm).
• The internal auditory pore diameter averaged 5.39 mm (±0.77 mm).
• Distances AB (41.10 mm ±4.22 mm) and BC (5.93 mm ±1.31 mm) were quantified, along with a vertical distance of 2.33 mm (±0.26 mm).

Conclusions:

• The quantitative anatomical data derived from this study are essential for surgical navigation.
• Accurate landmark identification and distance measurement can significantly reduce surgical trauma.
• This research provides valuable insights for neurosurgeons performing retrosigmoid approaches.