Transverse sinus stenosis is a narrowing in one of the two large channels at the back of the head that carry used blood out of the brain. When that drain backs up, fluid pressure inside the skull can rise, or blood rushing through the tight spot can be heard as a whoosh in one ear.1PubMed Central. Transverse Sinus Stenosis as an Underdiagnosed Cause of Chronic Headache: A Case Report A narrowing seen on a scan is not always the cause of symptoms, so doctors decide on treatment by how much it actually blocks flow, not by how it looks. For people whose narrowing does matter, a small stent placed through a vein in the groin has become a well-proven option when medicine isn’t enough.2PubMed. Intracranial venous sinus stenting for the treatment of lateral sinus stenoses: An analysis of 200 patients
Where the Transverse Sinuses Are and How They Narrow
Veins in the brain drain into large channels called sinuses, which empty into the jugular veins in the neck. Their walls are elastic and easily flattened, so pressure from the surrounding brain tissue can squeeze a transverse sinus against the skull.3PubMed Central. Transverse Sinus Stenosis as an Underdiagnosed Cause of Chronic Headache: A Case Report In other cases the blockage is inside the vein, from an enlarged fluid-draining bump on the vein wall, an old clot, or bands of fibrous tissue.4PubMed Central. Transverse Sinus Stenosis as an Underdiagnosed Cause of Chronic Headache: A Case Report
The two types tend to go with different symptoms. About 2 in 3 narrowings in people with raised skull pressure were from outside squeezing.5PubMed Central. Dural Venous Sinus Stenosis: Why Distinguishing Intrinsic-versus-Extrinsic Stenosis Matters. But about 4 in 5 narrowings in people with ear whooshing were blockages inside the vein.6PubMed Central. Dural Venous Sinus Stenosis: Why Distinguishing Intrinsic-versus-Extrinsic Stenosis Matters.
Narrowing on one side is common and often harmless. Many people have one transverse sinus that is naturally smaller than the other, and the larger side usually carries extra blood and keeps drainage working. Symptoms become more likely when the dominant side narrows or both sides do. Narrowing on one side is usually offset by the other side, with pressure rising up to about 12 mmHg, while narrowing on both sides can push pressure far higher.7PubMed. Effect of stenoses and occlusions in the cerebral venous vasculature on intracranial venous hemodynamics – a patient-specific computational model
Narrowing and high pressure can also feed each other. High pressure in the skull can squeeze a sinus, which slows drainage and raises pressure further, creating a self-feeding loop.8American Journal of Neuroradiology. Transverse Sinus Stenting for Idiopathic Intracranial Hypertension: A Review of 52 Patients and of Model Predictions In most people the narrowing is partly an effect of high pressure, and only in a minority is a fixed internal blockage the original cause.9American Journal of Neuroradiology. Transverse Sinus Stenting for Idiopathic Intracranial Hypertension: A Review of 52 Patients and of Model Predictions This changes how treatment works. Opening the vein can break the cycle even when the narrowing began as an effect, and lowering skull pressure by other means can relax a squeezed sinus.
Reports often use words like “stenosis,” “hypoplasia,” or “flow gap,” and they are not interchangeable. Hypoplasia means a sinus that was always small, while stenosis describes a narrowed segment that may have changed over time. A sinus that was always small is usually a normal variation, so a good first question for your doctor is whether the narrowing looks like a variant or an acquired change.
Symptoms It Can Cause
The narrowing is closely tied to idiopathic intracranial hypertension (IIH), a condition of raised fluid pressure around the brain with no other clear cause.10American Journal of Neuroradiology. Transverse Sinus Stenting for Idiopathic Intracranial Hypertension: A Review of 52 Patients and of Model Predictions Among people with IIH who needed a stent, headache was the most common symptom, followed by brief blackouts of vision and ear whooshing.11PubMed Central. Safety and Clinical Outcomes after Transverse Venous Sinus Stenting for Treatment of Refractory Idiopathic Intracranial Hypertension: Single Center Experience All of them had papilledema, a swelling at the back of the eye that an eye doctor can see, and more than half had lost some side vision.12PubMed Central. Safety and Clinical Outcomes after Transverse Venous Sinus Stenting for Treatment of Refractory Idiopathic Intracranial Hypertension: Single Center Experience Left untreated, swelling at the back of the eye can permanently damage sight, which makes it the most urgent symptom.
The headaches of raised pressure are often worse on waking or when lying flat, and may worsen with coughing or straining. The vision blackouts typically last seconds and often happen when standing up or bending over. Some people also notice double vision, because raised pressure can affect the nerves that move the eyes. Swelling at the back of the eye can be present without any vision complaints early on, which is why an eye exam matters even when sight seems fine.
The other main sign is pulsatile tinnitus, a rhythmic sound that keeps time with your heartbeat. Venous sinus narrowing is the most common identifiable cause of it.13PubMed Central. Emergence of Venous Stenosis as the Dominant Cause of Pulsatile Tinnitus It was the cause in about a third of people with this sound, and in over 4 in 10 women.14PubMed Central. Emergence of Venous Stenosis as the Dominant Cause of Pulsatile Tinnitus The typical sound is a whoosh in one ear that often fades or stops when gentle pressure is put on the neck vein on that side, a clue doctors check during an exam.15PubMed Central. Emergence of Venous Stenosis as the Dominant Cause of Pulsatile Tinnitus Most people with the whooshing sound had no headache or vision signs of high pressure.16PubMed Central. Emergence of Venous Stenosis as the Dominant Cause of Pulsatile Tinnitus
The whoosh is often louder in quiet places such as a bedroom at night, because there is less outside noise to cover it. Turning the head, lying on one side, or exercising can change its loudness, because these shift blood flow through the neck veins. A doctor can often hear it with a stethoscope near the ear or neck.
Vision dimming, blurring, or double vision means seeing an eye doctor soon. A sudden severe headache needs emergency care, since it may be something else entirely. Keeping a log of headaches, vision episodes, and when the whoosh happens gives your doctors something concrete to work from.
How Doctors Tell Whether a Narrowing Matters
The first tests are usually MRI or CT scans of the brain’s veins, called MRV or CTV on reports. These scans found fewer than half of the narrowings that were actually blocking flow.17Oral Abstracts. O-034 Correlation between angiographic stenosis and physiologic venous sinus outflow obstruction in idiopathic intracranial hypertension An MRV without contrast dye can also make a sinus look small when the real problem is a squeezed vein lower in the neck.18PubMed Central. Diagnosis of Transverse Sinus Hypoplasia in Magnetic Resonance Venography: New Insights Based on Magnetic Resonance Imaging in Combined Dataset of Venous Outflow Impairment Case–Control Studies So a normal scan does not fully rule out a significant narrowing, and an abnormal one does not prove it.
The deciding test is a venogram with pressure measurement, where a thin tube threaded through a vein reads pressure on each side of the narrowing.19Journal of Neuro-Ophthalmology. Stenting of the Transverse Sinuses in Idiopathic Intracranial Hypertension Measuring this pressure drop is the most important way to judge whether a narrowing matters.20Oral Abstracts. O-034 Correlation between angiographic stenosis and physiologic venous sinus outflow obstruction in idiopathic intracranial hypertension Newer 4D flow MRI may estimate the pressure drop across the narrowing without a catheter and could help pick who needs the invasive test.21PubMed. Estimation of venous sinus pressure drop in patients with idiopathic intracranial hypertension using 4D-flow MRI22PubMed Central. Correlation Between Trans-Stenotic Blood Flow Velocity Differences and the Cerebral Venous Pressure Gradient in Transverse Sinus Stenosis: A Prospective 4-Dimensional Flow Magnetic Resonance Imaging Study
The venogram is done through a vein in the groin, usually with sedation. Dye and X-rays show the veins while pressures are recorded. Most people go home the same or the next day, and in many centers a stent can be placed in the same session if the pressure drop is high.
Other tests answer a different question. A lumbar puncture measures the opening pressure of the spinal fluid to confirm IIH, and an eye exam checks for swelling and side-vision loss. These show whether pressure is high, while the venogram shows whether the vein is the reason.
A large pressure drop suggests the vein is truly blocking flow, which supports stenting as an option. A small or absent drop suggests the narrowing is not the main problem, and doctors then look for other explanations or treatments. They weigh the number together with symptoms, eye findings, and the response to medicine rather than using a single cutoff, because centers differ in what they treat.
First Treatments Weight Loss and Medicine
For IIH, weight loss and acetazolamide, a pill that reduces spinal fluid production, are the core first treatments.23Acta Medica Transilvanica. The Role of Venous Sinus Stenting in Idiopathic Intracranial Hypertension Illustrated by a Clinical Case Case Report Furosemide and topiramate are other medicines doctors may add.24Journal of Neuro-Ophthalmology. Stenting of the Transverses Sinuses in Idiopathic Intracranial Hypertension When maximum medicine fails, invasive treatment is usually recommended.25Journal of Neuro-Ophthalmology. Stenting of the Transverses Sinuses in Idiopathic Intracranial Hypertension Modest weight loss can lower skull pressure in many people, and doctors often refer people to dietitians or weight programs.
Acetazolamide commonly causes tingling fingers and a metallic taste with fizzy drinks. Doses are usually increased gradually. Stopping it without your doctor’s guidance is risky, since pressure can rebound.
Doctors usually give treatment time to work while watching the eyes closely, since vision is what must be protected. If swelling at the back of the eye is severe or sight is dropping quickly, they may move faster to a procedure instead of waiting.
When the whoosh is the only symptom, medicine aimed at skull pressure may do little for it. Treatment then depends on how disruptive the sound is, and some people choose simply to monitor it.
Venous Sinus Stenting
In venous sinus stenting, a small mesh tube is guided up from a groin vein and opened across the narrowing.26PubMed Central. Venous Sinus Stenting Using a Ledge‐Reducing Catheter, 0.088‐in. Catheter‐Extender With an External Single Point of Control: Technique and Multicenter Clinical Experience You are given blood thinners around the procedure to stop clots forming on the stent.27PubMed Central. Venous Sinus Stenting Using a Ledge‐Reducing Catheter, 0.088‐in. Catheter‐Extender With an External Single Point of Control: Technique and Multicenter Clinical Experience It suits only people with a real narrowing and a significant pressure drop, so the pressure test comes first.28Journal of Neurosurgery. Surgical outcomes in pediatric idiopathic intracranial hypertension: a systematic review and meta-analysis of CSF shunting, optic nerve sheath fenestration, and venous sinus stenting
Pressure is often measured again afterward to see whether the drop across the narrowing has fallen. The stent stays in permanently, and the vein wall grows over it with time.
In 200 patients, about 79% had their main symptoms resolve, and about 10% saw them return.29PubMed. Intracranial venous sinus stenting for the treatment of lateral sinus stenoses: An analysis of 200 patients Results were similar whether or not people had IIH, and no deaths or permanent harm occurred over about two years.30PubMed. Intracranial venous sinus stenting for the treatment of lateral sinus stenoses: An analysis of 200 patients In another group, moderate to severe headaches fell from half of patients to none at six months, and the whoosh went away in 95%.31Egyptian Journal of Radiology and Nuclear Medicine. Transverse sinus stenting for treatment of idiopathic intracranial hypertension Eye swelling dropped from 75% to 10% of patients in six months.32Egyptian Journal of Radiology and Nuclear Medicine. Transverse sinus stenting for treatment of idiopathic intracranial hypertension Many people can cut or stop their pressure medicines afterward, and quality of life scores improve.33PubMed Central. Safety and Clinical Outcomes after Transverse Venous Sinus Stenting for Treatment of Refractory Idiopathic Intracranial Hypertension: Single Center Experience34Electronic Poster Abstracts. E-003 Quality of life, need for retreatment, and the re-equilibration effect after venous sinus stenting for idiopathic intracranial hypertension
Expect a hospital stay of about a night. The whoosh often stops right away, while headaches may ease more slowly. Follow-up eye exams and imaging check that the stent stays open.
A person who cannot safely take blood thinners may not be a good candidate, so the team reviews bleeding history first. Stenting treats a narrowing and does not replace weight loss, which may still be advised.
Useful questions before agreeing: What was my measured pressure drop? How many of these procedures does the team do each year? How long will I take blood thinners?
Risks of Stenting and Blood Thinners Afterward
Serious complications such as bleeding in the brain occur in about 2 in 100 stenting procedures.35Journal of Otolaryngology-Head and Neck Surgery. What Should Otolaryngologists Know About Dural Venous Sinus Stenting? New narrowing develops in about 18% of people, but only about 10% have symptoms or need another procedure.36Journal of Otolaryngology-Head and Neck Surgery. What Should Otolaryngologists Know About Dural Venous Sinus Stenting? Most of it is narrowing in the vein just beside the stent, seen in about 11% with 6% needing retreatment.37Journal of Otolaryngology-Head and Neck Surgery. What Should Otolaryngologists Know About Dural Venous Sinus Stenting? Because narrowing next to the stent can cause symptoms to return, report any return of headache or whoosh.38PubMed Central. The Impact of Stent Length on Stent-Adjacent Stenosis Following Transverse Sinus Stenting in Idiopathic Intracranial Hypertension
Sudden severe headache, weakness, confusion, or trouble speaking after the procedure needs emergency care right away. Groin bruising or soreness at the puncture site is common and usually settles, but a rapidly growing swelling or heavy bleeding needs urgent attention.
A returning headache, vision change, or whoosh after a good response is a reason to contact the team rather than wait for the next appointment. The cause may be narrowing beside the stent, or a flare of pressure from other causes such as weight regain. Doctors usually repeat imaging or pressure measurement before deciding on another procedure.
You usually take two anti-clotting pills for months after the stent. Three months worked as well as six or more for keeping stents open.39PubMed. Dual Antiplatelet Therapy Duration After Venous Sinus Stenting for Idiopathic Intracranial Hypertension and Stent Survival-Is Longer Necessarily Better? A Meta-Regression Minor bleeding such as gum bleeding can occur on these pills.40PubMed Central. Safety and efficacy comparison between OACs plus single antiplatelet and dual antiplatelet therapy in patients with cerebral venous sinus stenosis poststenting Tell dentists and other doctors that you take them, and expect easy bruising. Stopping early without your team is dangerous, because the stent could clot.
Other Surgeries and How They Compare
Optic nerve sheath fenestration, a cut in the sheath around the eye nerve, improved eye swelling in 80% but headache in only 44%.41PubMed Central. Meta-Analysis of CSF Diversion Procedures and Dural Venous Sinus Stenting in the Setting of Medically Refractory Idiopathic Intracranial Hypertension Shunts draining spinal fluid improved headache in 80%, but 43% needed another surgery.42PubMed Central. Meta-Analysis of CSF Diversion Procedures and Dural Venous Sinus Stenting in the Setting of Medically Refractory Idiopathic Intracranial Hypertension So eye nerve surgery suits urgent sight saving, while shunts control pressure but are often revised.43Journal of Neurosurgery. Surgical outcomes in pediatric idiopathic intracranial hypertension: a systematic review and meta-analysis of CSF shunting, optic nerve sheath fenestration, and venous sinus stenting
In fenestration, the surgeon makes a small opening in the sheath around the optic nerve behind the eye, so fluid can escape and pressure on the nerve falls. It protects the nerve directly, which explains why eye swelling improves more than headache. It does not lower pressure inside the skull as a whole, so headaches often need other treatment.
A shunt is a thin tube that drains spinal fluid from the spine or brain into another body space, usually the abdomen. Tubes can block, kink, or drain too much, causing low-pressure headaches, which is why further surgeries are common. Shunts lower pressure whether or not the veins are narrowed, so they can help people who are not stent candidates.
As a general guide, fast vision loss favors eye nerve surgery, a narrowing with a clear pressure drop favors stenting, and a shunt is an option when there is no significant narrowing, though the choice depends on each person’s situation. Children see similar results across options.44Journal of Neurosurgery. Surgical outcomes in pediatric idiopathic intracranial hypertension: a systematic review and meta-analysis of CSF shunting, optic nerve sheath fenestration, and venous sinus stenting
A separate operation reshapes the vein from outside near the ear, and it eased or stopped the whoosh in 98% of people in one group.45PubMed Central. Extraluminal Sigmoid Sinus Angioplasty: A Pertinent Reconstructive Surgical Method Targeting Dural Sinus Hemodynamics to Resolve Pulsatile Tinnitus It addresses a vein problem near the ear, such as a vein sitting in a bony pocket, rather than pressure inside the skull, so it is mainly for people whose main problem is the whoosh. It is performed in specialized centers, and stenting is more widely available, so the choice depends on local expertise.