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Rare kidney & urinary condition

Megaureter in adults

Megaureter - a grossly dilated ureter, usually from a congenitally abnormal segment at the bladder junction - can surface in adults through infections, stones or loin pain, and management runs from surveillance to reimplantation surgery.

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

    Types matter: obstructed, refluxing, both or neither - each behaves differently.

  • 02

    Many adult megaureters are stable and safely watched with periodic imaging and function tests.

  • 03

    Presentations that force action: recurrent infections, stones forming in stagnant urine, pain or deteriorating kidney function.

  • 04

    Diuretic renography distinguishes true obstruction from mere capacious dilatation.

  • 05

    Definitive surgery - tailoring the ureter and reimplanting it into the bladder - is effective; endoscopic approaches suit selected cases.

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 short segment of ureter that lacks normal muscle coordination sits just above the bladder in most megaureters; urine crosses it, but sluggishly, and the ureter above dilates into a winding reservoir. The dilated system is vulnerable exactly where urine lingers - to infection and to stone formation - though plenty of megaureters discovered incidentally in adults have clearly coexisted peacefully with their owners for decades.

The adult urology approach is conservative by default and surgical by indication: imaging plus a drainage-and-function study classifies the system, stable asymptomatic dilatation earns scheduled surveillance, and genuine obstruction, recurrent sepsis or falling function justifies reconstruction - excising the adynamic segment, tapering the ureter and reimplanting it - with good protection of kidney function when done before damage accrues. 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 Megaureter in adults.

Quick, plain-English answers to what people ask us most.

  • What is megaureter in adults?

    Megaureter refers to an abnormally widened ureter, the tube carrying urine from the kidney to the bladder, which can be present from birth (congenital) or, less commonly, develop later due to obstruction or other causes affecting adults. It can range from causing no problems to leading to recurrent infections or kidney damage.

  • What causes megaureter in adults?

    In adults, it's often a congenital condition present since birth that either wasn't previously identified or has become more symptomatic over time, though it can occasionally develop due to obstruction from a stone, stricture, or other acquired cause. Identifying whether it's due to obstruction, reflux, or another mechanism guides appropriate management.

  • What are the symptoms of megaureter in adults?

    Many cases cause no symptoms and are found incidentally on imaging, while others cause recurrent urinary tract infections, flank pain, or, in more significant cases, gradual kidney function decline if there's associated obstruction. Symptoms depend significantly on whether there's ongoing obstruction or reflux causing back-pressure on the kidney.

  • Is megaureter dangerous?

    It can be, if associated with significant obstruction or reflux causing recurrent infections or progressive kidney damage, though many cases, particularly if non-obstructive and non-refluxing, cause no significant problems and simply need monitoring. A thorough assessment helps determine the specific type and whether active treatment is needed.

  • Is megaureter hereditary?

    Congenital megaureter is a developmental variation present from birth, and while it's not typically considered a straightforwardly inherited condition, some structural urinary tract abnormalities can occasionally cluster in families. Most cases occur without a specific known family history.

  • Can megaureter be treated?

    Treatment depends on the specific type and whether it's causing problems: many cases need only monitoring, while those causing recurrent infections, obstruction, or kidney function decline may need surgical correction to improve urine drainage. Your urologist will determine the most appropriate approach based on your specific imaging and symptom pattern.

  • How is megaureter diagnosed?

    Diagnosis typically involves imaging such as ultrasound or CT scan showing the widened ureter, sometimes with additional specific tests to assess whether there's obstruction, reflux, or neither, which helps classify the specific type and guide management. This classification is important for determining whether active treatment is needed.

  • How is megaureter treated in adults?

    Treatment ranges from simple monitoring for asymptomatic, non-obstructive cases, to surgical reconstruction of the ureter for those causing significant symptoms, obstruction, or kidney impairment. A specialist urologist will tailor treatment based on the specific findings and impact on kidney function.

  • Obstructive vs refluxing megaureter — what's the difference?

    Obstructive megaureter involves a blockage preventing normal urine flow, causing back-pressure on the kidney, while refluxing megaureter involves urine flowing backward from the bladder up the ureter, both of which can potentially affect kidney health but through different mechanisms requiring somewhat different management approaches. Specific imaging tests help distinguish between these different types.

  • When should I see a specialist about megaureter, and how quickly can I be seen privately?

    Recurrent urinary infections or flank pain, or megaureter found incidentally on imaging, should prompt urology assessment. Private urology consultations can typically be arranged within about two weeks, considerably faster than standard NHS waiting times.