Jugular vein compression

Jugular vein compression in Eagle syndrome is narrowing of the internal jugular vein, the main vein draining blood from the brain, where it passes between the styloid process and the transverse process of the first vertebra of the neck (C1, the atlas). It is also called styloidogenic jugular venous compression syndrome, atlanto-styloid compression syndrome or stylo-jugular compression123. Most reports date from 2012 onward, and the condition is increasingly recognized as a cause of raised pressure inside the skull4.

Where and how the vein is compressed

Just below the skull, the upper part of the internal jugular vein runs through a narrow gap with the styloid process in front and the C1 transverse process behind45. If the gap is small, the vein is pinched between the two bones.

Several features make the gap narrower:

• A long or backward-pointing styloid process. In a series of 10 patients, the styloid averaged 31.0 mm, compared with 19.0 mm in patients with raised intracranial pressure from other causes2. In a 2012 report of two patients, the styloid was prominent and lay unusually far back1.
• A wide C1 transverse process. The same series measured the gap between the styloid and C1 at an average of 2.9 mm in patients, against 9.9 mm in the comparison group2.
• Soft tissue. The back part of the digastric muscle, the small muscles attached to the styloid, the occipital artery and the sheath of connective tissue around the vein can all add to the compression3. In one reported patient, the internal carotid artery itself pressed the vein against the bone4.
• Head position. Turning the head to the opposite side raised the pressure in the jugular vein in all 10 patients in the Zhao series, and bending the neck forward made the headache worse in 72.

The compression is often on both sides. All 10 patients in the Zhao series had bony compression of venous drainage on both sides2, and 13 of 14 in a 2026 surgical series had both veins decompressed3. This matters because blood from the brain can leave through either jugular vein and through smaller collateral veins. Narrowing of one vein may cause no symptoms if the other routes compensate; it is more likely to matter when both veins are narrowed or when the narrowed vein is the dominant one16.

Jugular compression and intracranial pressure

When the jugular veins are narrowed, blood leaving the brain is diverted into smaller collateral veins, which may not carry it all. The pressure in the veins inside the skull rises. Because cerebrospinal fluid, the fluid around the brain, drains into those veins, its pressure rises too6. The result is intracranial hypertension: raised pressure inside the skull.

When no cause for raised intracranial pressure is found, the condition is called idiopathic intracranial hypertension (IIH), or pseudotumor cerebri. Jugular compression at C1 is one cause that can be mistaken for it. In the 2012 report, removing the styloid relieved both the narrowing and the symptoms of raised pressure1. In another case, a teenager whose raised pressure had not responded to medication or a shunt improved once a C1 transverse process compressing the vein was removed7.

How much IIH is caused by jugular compression is disputed. The Zhao series described styloid-related compression as a rare cause of IIH2. Others have proposed that obstruction of jugular outflow, at C1 and lower in the neck, underlies a large share of IIH; this "jugular hypothesis" remains to be tested, and two of its authors have a financial interest in a company developing venous treatments6.

Symptoms

The symptoms are mostly those of raised venous and intracranial pressure:

• chronic headache, often with a feeling of pressure in the head
• pulsatile tinnitus, a whooshing sound in time with the heartbeat
• blurred or disturbed vision, and swelling of the optic nerves seen on eye examination
• difficulty concentrating, often described as brain fog
• symptoms that change with head and neck position

Chronic headache was reported in 68% of published patients with venous complications of Eagle syndrome8. A review of surgical series lists headache, blurred vision, tinnitus and brain fog as the main symptoms9. Many patients also have the throat and ear pain of classic Eagle syndrome. The symptoms page compares the forms.

Diagnosis

Diagnosis needs imaging of the veins and, often, a measurement of whether the narrowing obstructs flow.

• CT venography with 3D reconstruction shows the narrowing at C1, the gap between the styloid and C1, and any collateral veins5.
• MR venography shows flow and collateral veins without radiation.
• Imaging with the head turned can reveal compression that only appears in certain positions25.
• Catheter venography with manometry measures the pressure on each side of the narrowing. A significant pressure drop shows that the narrowing obstructs flow12. It is considered the reference test in selected cases5.
• An eye examination, and sometimes a lumbar puncture to measure the pressure of the cerebrospinal fluid, show whether intracranial pressure is raised.

Narrowing of the jugular vein at C1 is common in people without symptoms, so a narrowed vein on a scan isn't enough for a diagnosis. The narrowing has to fit the symptoms, and ideally be shown to obstruct flow5.

Treatment

Medication

Medication for raised intracranial pressure, such as acetazolamide, can ease symptoms but doesn't relieve the compression itself. In one reported patient, neither medication nor a shunt controlled the pressure until the compressing bone was removed7.

Stenting

A stent is a metal mesh tube placed inside the vein through a catheter to hold it open. Stenting is the usual treatment for narrowed veins inside the skull9, but when bone compresses the vein from outside, the bone stays where it is. The authors of the 2012 report warned that primary stenting is ineffective in bony compression and may worsen the obstruction1.

A 2024 US series of jugular vein stenting included 29 patients and 33 procedures; 13 patients had already had open decompression and styloidectomy. About 75% were reported to improve at first; the authors reported lasting improvement in 12 patients over a mean follow-up of 4.5 months. Complications followed 33% of procedures: in one patient the stent moved to the heart, and seven developed shoulder pain or weakness, which persisted in two10. The accessory nerve, which works the trapezius muscle of the shoulder, crosses the vein at this level. When a stent is used where bone compresses the vein, surgeons recommend removing the bone first7, and a 2026 review proposes operating first and keeping stenting for cases that don't respond5.

Surgery

Surgery removes the structures pressing on the vein. The operations differ in how much they remove:

• Styloidectomy removes the styloid process. It is the most common operation for jugular compression9, and it relieved the narrowing and symptoms in both patients in the 2012 report1.
• C1 transverse process resection removes the tip of the C1 transverse process, the bone behind the vein7.
• Circumferential decompression combines both, and also frees the vein from the surrounding muscles, the occipital artery and the sheath of tissue around it. In a 2026 series of 14 patients, 13 of them operated on both sides, the cross-sectional area of the vein at its narrowest point more than doubled: from 18.3 to 46.1 mm² on the right and from 10.1 to 28.8 mm² on the left. Nine patients reported significant improvement and five moderate improvement over an average follow-up of 16 months. One had temporary shoulder weakness from accessory nerve palsy3.

Other published results are similar in direction. In the Zhao series, 9 of 10 patients improved or recovered after decompression through the neck; one had temporary swallowing difficulty and facial drooping, and one reported jaw numbness2. A 2021 review of 149 published patients found general improvement in 58 of the 80 whose outcome was recorded, and complications in 9 of the 39 with complication data11. Where the carotid artery is the compressing structure, it can be moved forward and fixed away from the vein4.

The operations are done through the upper neck, close to the accessory, vagus, hypoglossal and facial nerves and the vertebral artery, which runs through the C1 transverse process. Nerve injury, usually temporary, is the main risk.

What the evidence shows

All the published evidence comes from case reports and small series from single centers. There are no large cohort studies and no trials comparing surgery with stenting or medication9. The series consistently report improvement after decompression, but they are small, follow patients for months to a few years, and often rely on patients' own ratings of improvement. Which patients benefit most, and how long the benefit lasts, are still open questions.

Study	Design	Size	Population	Main finding	Limitation
Dashti et al. 2012	case report	2 patients		Styloid removal relieved jugular narrowing and intracranial hypertension in both patients.	Two patients.
Zhao et al. 2019	case series	10 patients, 11 controls	Consecutive patients operated in Phoenix, 2009 to 2017, compared with patients with idiopathic intracranial hypertension and normal venography.	9 of 10 improved or resolved after transcervical decompression.	Small, retrospective and single-center.
Scerrati et al. 2021	literature review	149 patients in 13 articles	Published patients with jugular compression by the styloid process or cervical spine.	General improvement in 58 of 80 patients with outcome data; complications in 9 of 39 with complication data.	Small observational studies with inconsistent reporting; different numbers of patients contribute to each outcome.
Fargen et al. 2024	case series	29 patients, 33 procedures	Patients with venous outflow disorders stented at one US center, 2019 to 2023; 69% had a connective tissue disorder.	About 75% were reported to improve initially; lasting improvement was reported in 12 patients over a mean follow-up of 4.5 months; complications in 11 of 33 procedures (33%).	Retrospective, single center, short follow-up.
Petersingham et al. 2025	literature review	14 studies		Styloidectomy is the most common operation; no large cohorts or trials exist.	A literature review of small studies with varied outcome measures.
Aghayev et al. 2026	case series	14 patients	Patients with jugular narrowing between the C1 transverse process and the styloid process; 13 of 14 had both sides decompressed.	Vein cross-section roughly 2.5 to 3 times larger after surgery; 9 reported significant and 5 moderate improvement.	Retrospective, 14 patients, with improvement self-reported on a subjective scale. Written by Dr. Aghayev, who edits this site.

References

1. Dashti SR, Nakaji P, Hu YC, et al. Styloidogenic jugular venous compression syndrome: diagnosis and treatment: case report. Neurosurgery. 2012;70(3):E795-E799. doi:10.1227/NEU.0b013e3182333859 PubMed ↩
2. Zhao X, Cavallo C, Hlubek RJ, et al. Styloidogenic jugular venous compression syndrome: clinical features and case series. Oper Neurosurg. 2019;17(6):554-561. doi:10.1093/ons/opz012 PubMed ↩
3. Aghayev K, Demir H, Ozdol C, Comella Z, Vrionis FD. Bilateral circumferential internal jugular vein decompression for atlanto-styloid compression syndrome: report of 14 cases. Oper Neurosurg. Published online September 3, 2026. doi:10.1227/ons.0000000000002185 PubMed ↩
4. Aghayev K, Comella Z, Vrionis FD. Internal carotid artery anterior transposition for internal jugular vein decompression: illustrative case. J Neurosurg Case Lessons. 2026;12(9):CASE26599. doi:10.3171/CASE26599 PubMed ↩
5. Bănică DA, Zamfirescu VI, Rusu MC, Brezean I. Compression syndromes of the stylohyoid complex: neural, arterial, and venous phenotypes in a dynamic neurovascular corridor. Tomography. 2026;12(9):127. doi:10.3390/tomography12090127 PubMed ↩
6. Fargen KM, Midtlien JP, Margraf CR, Hui FK. Idiopathic intracranial hypertension pathogenesis: the jugular hypothesis. Interv Neuroradiol. 2026;32(5):2198-2207. Published online August 8, 2024. doi:10.1177/15910199241270660 PubMed ↩
7. Fritch C, Voronovich Z, Carlson AP. C1 transverse process resection for management of jugular stenosis. Oper Neurosurg. 2020;19(2):E209-E213. doi:10.1093/ons/opaa032 PubMed ↩
8. Thielen A, Brizzi V, Majoufre C, Nicot R, Schlund M. Eagle syndrome and vascular complications: a systematic review. Int J Oral Maxillofac Surg. 2025;54(1):31-42. doi:10.1016/j.ijom.2024.09.011 PubMed ↩
9. Petersingham G, Shrestha N, Elliott M, et al. Invasive surgical management of cervical internal jugular venous compression: a literature review. J Clin Neurosci. 2025;137:111304. doi:10.1016/j.jocn.2025.111304 PubMed ↩
10. Fargen KM, Midtlien JP, Belanger K, Hepworth EJ, Hui FK. The promise, mystery, and perils of stenting for symptomatic internal jugular vein stenosis: a case series. Neurosurgery. 2024;95(2):400-407. doi:10.1227/neu.0000000000002891 PubMed ↩
11. Scerrati A, Norri N, Mongardi L, et al. Styloidogenic-cervical spondylotic internal jugular venous compression, a vascular disease related to several clinical neurological manifestations: diagnosis and treatment, a comprehensive literature review. Ann Transl Med. 2021;9(8):718. doi:10.21037/atm-20-7698 Source ↩

Related pages

• Vascular Eagle syndromeVascular Eagle syndrome: how the styloid process can compress or tear the carotid artery, the link with dissection and stroke, and how it is treated.
• Diagnosis and imagingHow Eagle syndrome is diagnosed: examination, CT with 3D reconstruction, CT angiography and venography, jugular pressure tests and reading a report.
• Treatment of Eagle syndromeHow Eagle syndrome is treated: medication and injections, styloidectomy through the mouth or neck, robotic and minimally invasive surgery, and results.
• Anatomy of the styloid processThe styloid process and stylohyoid ligament: normal length, types of ossification, the vessels and nerves around them, and the gap between the styloid and C1.