Venous Sinus Stenting for Idiopathic Intracranial Hypertension

What is idiopathic intracranial hypertension?

Idiopathic intracranial hypertension (IIH) — also known as pseudotumor cerebri — is a condition of persistently raised pressure inside the skull, without a tumour, infection, or other structural cause on scanning. It classically affects women of childbearing age, particularly those who are overweight, though it can occur in others too. The three hallmark features are chronic headache, papilledema (swelling of the optic nerve, seen on eye examination), and progressive visual disturbance — untreated, IIH can lead to permanent vision loss, which is why it needs proper diagnosis and monitoring rather than being dismissed as "just headaches."

Why does venous sinus stenosis matter in IIH?

For years, IIH was treated purely as a disorder of excess cerebrospinal fluid production or reduced absorption. More recent understanding has identified that many IIH patients also have a narrowing in one of the brain's major venous sinuses — the channels that drain blood out of the brain. This narrowing raises the pressure within the venous system, which in turn raises pressure throughout the brain. In some patients, it isn't clear whether the narrowing is a cause of IIH or a consequence of the raised pressure itself, creating a self-reinforcing cycle — but treating the narrowing directly has been shown to reduce pressure regardless of which came first.

Traditional management, and where it falls short

IIH has traditionally been managed with weight loss, medications such as acetazolamide to reduce CSF production, and — for progressive or severe cases — surgical options like CSF diversion (a shunt) or optic nerve sheath fenestration. These remain important tools, but shunts carry their own long-term risks, including blockage, infection, and the need for revision surgery, and don't address a venous sinus narrowing directly if one is present.

What is venous sinus stenting?

Venous sinus stenting is a minimally invasive, catheter-based procedure that treats the venous narrowing directly, rather than working around it. A catheter is guided through the blood vessels — typically via the femoral vein — up into the affected venous sinus. Pressure is measured directly across the narrowed segment to confirm a genuine gradient exists, then a stent is deployed to hold the sinus open, restoring more normal venous drainage and reducing the pressure transmitted back through the brain.

Direct intracranial pressure monitoring during stenting has shown that pressure can drop immediately once the stent is deployed, and that this reduction is sustained afterward — not just a short-term effect. In published series, more than three-quarters of patients report meaningful improvement in headaches after stenting, with roughly half seeing improvement in associated tinnitus and in formal visual/ophthalmological testing. Complications are uncommon but can include re-narrowing of the stented segment, a groin access-site issue, or, rarely, bleeding.

Who is a candidate?

Venous sinus stenting is considered for patients with a confirmed diagnosis of IIH who also have a demonstrated venous sinus stenosis with a measurable pressure gradient across it — this is established with a combination of MR or CT venography and, definitively, catheter venography with direct pressure measurement. It's typically considered for patients whose symptoms persist despite medical therapy, or as an alternative to shunt surgery for suitable candidates, since stenting avoids implanting a permanent CSF diversion device.