Sigmoid sinus diverticulum

Sigmoid sinus diverticula are venous outpouchings from the sigmoid sinus that intrude into the mastoid bone, which can occur either with an intact but remodelled sigmoid plate or with sigmoid sinus dehiscence.

The prevalence of sigmoid sinus diverticulum or dehiscence is about 1% 1.

Many patients are asymptomatic. However, sigmoid sinus diverticulum and dehiscence are among the most common causes of pulsatile tinnitus 1.

The outpouching is most directly demonstrated on MR or CT venography. The remodelling or erosion of the sigmoid plate can be demonstrated on non-contrast-enhanced temporal bone CT.

Endovascular treatment consists of stenting of the sigmoid sinus and coil embolization of the diverticulum 2. Open surgical treatment consists of resurfacing the sigmoid plate and extravascular reduction of the diverticulum by bone wax packing or electrocoagulation 3.

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Article information

rID: 65936
System: Head & Neck
Synonyms or Alternate Spellings:

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