The sigmoid sinus is a paired intradural venous channel of the brain.
Anatomy
The sigmoid sinus runs within the sigmoid sinus groove in the posterior cranial fossa. The sigmoid sinus drains venous blood from the transverse sinus and the superior petrosal sinus and inferior and continues as the jugular foramen into the internal jugular vein. The sigmoid sinus exhibits substantial anatomical variability[^1].
Clinical relevance
pulsatile tinnitus may, for example, be caused by a sigmoid sinus diverticulum or a dural arteriovenous fistula in the region of the sigmoid sinus[^2].
Imaging
The sigmoid sinus can be visualized using various imaging modalities, such as CT, MRI, and DSA.
