Rare kidney & urinary condition
Renal artery fibromuscular dysplasia
Fibromuscular dysplasia (FMD) is a non-atherosclerotic disease of artery walls that narrows renal arteries - a classic cause of hypertension in younger women - and angioplasty can sometimes cure the blood pressure.
Key points
The essentials at a glance.
What to look out for, how the diagnosis is confirmed, who looks after it, and the options that exist.
-
01
Suspect it with hypertension before 35, sudden-onset or resistant hypertension, or a bruit over the kidney arteries - especially in women.
-
02
The 'string of beads' appearance on CT or catheter angiography is diagnostic of the common form.
-
03
FMD is systemic: carotid and other arteries can be involved, and screening head-to-pelvis imaging once is recommended; dissections and aneurysms are its complications.
-
04
Balloon angioplasty (without stenting) can normalise or improve blood pressure, with the best results early after onset.
-
05
Lifelong blood pressure follow-up and antiplatelet therapy are standard; smoking worsens outcomes.
Understanding it
What it is, and what happens next.
In plain English - what is going on, how specialists confirm it, and the routes to treatment in the UK.
FMD replaces segments of the artery's muscular wall with fibrous ridges, throttling flow through webs and beads rather than the plaques of atherosclerosis. In the renal arteries the kidney responds to the perceived drought by driving renin and blood pressure upward - and because sufferers are often women in their 30s and 40s with no other risk factors, the diagnosis rewards clinicians who question 'ordinary' hypertension in the wrong patient.
Dedicated imaging settles it, and management is genuinely interventional where appropriate: angioplasty of a pressure-gradient-producing stenosis offers a real chance of cure or drug reduction, particularly when hypertension is recent; beyond the kidney, a one-off vascular survey maps the systemic disease, and follow-up watches both blood pressure and the arterial wall complications the condition can produce. In many parts of the UK, routine NHS outpatient referrals for problems like this can take several months, whereas an initial appointment with a private consultant is typically available within around two weeks.
A quiet reminder
This guide is for information, not medical advice.
Your GP or specialist knows your history and can tell you which parts apply to you. If in doubt, speak to them.
Published 2026-09-27 · Next review 2027-09-27
Frequently asked
Common questions about Renal artery fibromuscular dysplasia.
Quick, plain-English answers to what people ask us most.
-
What is renal artery fibromuscular dysplasia?
Fibromuscular dysplasia (FMD) is a non-atherosclerotic disease of the artery wall that narrows the renal arteries supplying the kidneys - a classic cause of high blood pressure in younger women that differs from the usual age-related narrowing.
-
What causes renal artery FMD?
The exact cause is not fully understood, but it involves abnormal development of the artery wall's muscular and fibrous tissue, is much more common in women, and can sometimes run in families.
-
What are the symptoms of renal artery FMD?
The most common presentation is high blood pressure at a younger age than typical, sometimes difficult to control with standard medication, occasionally with a specific sound (bruit) heard over the abdomen.
-
Is renal artery FMD dangerous?
It can cause significant, sometimes hard-to-control high blood pressure and, rarely, artery dissection or aneurysm, so once identified it needs appropriate monitoring and treatment to reduce cardiovascular risk.
-
How is renal artery FMD diagnosed?
Diagnosis typically involves imaging of the renal arteries, such as CT or MR angiography, which shows the characteristic 'string of beads' appearance of the affected artery.
-
How is renal artery FMD treated?
Treatment includes blood pressure medication, and for significant narrowing causing uncontrolled hypertension, balloon angioplasty can open the artery and often improves or cures the blood pressure problem.
-
Renal artery FMD vs atherosclerotic renal artery stenosis - what's the difference?
Atherosclerotic narrowing occurs from typical age-related plaque build-up, usually in older people with vascular risk factors, whereas FMD affects the artery wall itself in a distinct pattern, occurring predominantly in younger women without typical vascular risk factors.
-
When should I see a specialist about renal artery FMD?
See a doctor if you develop high blood pressure at a young age or blood pressure that is difficult to control, so imaging can be arranged. A private specialist can typically be seen within about two weeks.