Rare kidney & urinary condition
Retroperitoneal fibrosis and the kidneys
Retroperitoneal fibrosis is a rare inflammatory scarring process around the aorta that ensnares the ureters, silently obstructing the kidneys; steroids and timely drainage protect kidney function.
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.
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01
Presentation is vague - back, flank or abdominal ache, weight loss, malaise - and kidney failure from bilateral ureteric obstruction is a common first finding.
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02
Many cases are IgG4-related disease; drugs, radiotherapy, infection and malignancy are other causes, and cancer mimics must be excluded (biopsy where atypical).
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03
CT or MRI shows the periaortic mantle of tissue drawing the ureters inward.
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04
Obstructed kidneys are decompressed promptly with stents; steroids then shrink the fibroinflammatory tissue in most.
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05
Relapse is common on withdrawal - steroid-sparing agents (including rituximab for IgG4 disease) and long surveillance are standard.
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.
A cuff of chronic inflammation and fibrosis forms around the lower aorta and creeps outward, tethering the ureters and drawing them toward the midline until urine cannot pass. Because the process is painless in the kidneys themselves, function can be largely lost before anyone measures a creatinine - the disease is a standing argument for taking unexplained back pain with inflammatory blood markers seriously.
Management is a partnership between urology and physicians: stents or nephrostomies rescue the kidneys first, imaging and targeted biopsy separate idiopathic and IgG4-related disease from lymphoma and other mimics, and medical therapy - corticosteroids, with rituximab or other agents for relapse-prone disease - dissolves the mantle over months while serial imaging confirms the ureters have been released. 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 Retroperitoneal fibrosis and the kidneys.
Quick, plain-English answers to what people ask us most.
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How does retroperitoneal fibrosis affect the kidneys?
Retroperitoneal fibrosis is a rare inflammatory scarring process around the aorta that can ensnare the ureters, the tubes draining urine from the kidneys, silently obstructing them and threatening kidney function if not caught.
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What causes retroperitoneal fibrosis?
Many cases are related to an autoimmune inflammatory process (sometimes linked to IgG4-related disease), while others are triggered by certain medications, previous radiotherapy, infection, or malignancy.
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What are the symptoms of retroperitoneal fibrosis affecting the kidneys?
Symptoms can be surprisingly subtle - dull back or flank pain, fatigue, and sometimes reduced urine output - because the obstruction develops gradually, which is why kidney function can decline silently before it is noticed.
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Is retroperitoneal fibrosis dangerous?
Yes, if the ureters become significantly obstructed it can lead to serious kidney damage, so timely diagnosis and treatment, often including steroids and sometimes procedures to relieve the obstruction, are important.
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How is retroperitoneal fibrosis diagnosed?
Diagnosis typically involves imaging such as CT or MRI showing the characteristic tissue surrounding the aorta and ureters, blood tests, and sometimes biopsy to confirm the diagnosis and exclude other causes.
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How is retroperitoneal fibrosis treated?
Treatment usually involves steroids or other immunosuppressive medication to reduce inflammation, alongside procedures such as ureteric stenting to relieve any kidney obstruction if present.
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Retroperitoneal fibrosis vs kidney stones - what's the difference?
Kidney stones typically cause sudden, severe colicky pain, whereas retroperitoneal fibrosis develops gradually with more subtle, dull symptoms, making imaging essential to distinguish between the two causes of urinary tract obstruction.
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When should I see a specialist about retroperitoneal fibrosis?
See a doctor for unexplained back pain with declining kidney function, so imaging can be arranged. A private nephrologist or urologist can typically be seen within about two weeks.