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Morphologic variations of the sigmoid sinus on computed tomography: a classification-based study.

Mahmut Sabri Medişoğlu¹, Melisa Öçbe²

¹Faculty of Dentistry, Department of Anatomy, Kocaeli Health and Technology University, Kocaeli, 41275, Turkey.

Surgical and Radiologic Anatomy : SRA

|May 19, 2026

Summary

Sigmoid sinus morphology varies with age and gender, with younger individuals showing higher-risk configurations. This anatomical variability is crucial for surgical planning in lateral skull base and otologic procedures.

Keywords:

Anatomical variation Sigmoid sinus Temporal bone CT

Related Experiment Videos

Area of Science:

Anatomy
Radiology
Neurosurgery

Background:

The sigmoid sinus is a critical dural venous structure.
Anatomical variations of the sigmoid sinus impact lateral skull base and otologic surgeries.
Understanding these variations is key to minimizing surgical risks.

Purpose of the Study:

To classify sigmoid sinus morphology using a surgical reference-based system.
To assess the relationship between sigmoid sinus morphology and demographic variables (age, gender).

Main Methods:

Retrospective analysis of 241 high-resolution temporal bone CT scans.
Classification of sigmoid sinus morphology into four types based on Sun et al.'s system.
Bilateral measurement of sigmoid sinus width and depth, with statistical analysis for age and gender associations.

Main Results:

Left sigmoid sinus width was significantly greater than the right.
Type 3 and Type 4 configurations predominated; Type 1 was absent.
Age was significantly associated with left-sided sigmoid sinus type, with more medial configurations in older individuals.

Conclusions:

Sigmoid sinus morphology shows significant variation with age and gender.
The prevalence of high-risk configurations in younger individuals highlights the need for individualized preoperative assessment.
The classification system offers anatomical insights for radiologic evaluation, requiring further validation for surgical decision-making.