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 remodeled sigmoid plate or with sigmoid sinus dehiscence.

Epidemiology

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

Associations

• idiopathic intracranial hypertension

Clinical presentation

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

Radiographic features

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

Treatment and prognosis

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

Siehe auch:

• Sinus sigmoideus