Why Do Bladder Neck Contractures Happen After Prostate Surgery?
By Alex J. Vanni, MD, FACS — Director, Center for Reconstructive Urologic Surgery, Lahey Clinic • Published September 20, 2026
The short answer: a bladder neck contracture is scar tissue that forms where the prostate was treated, narrowing the outlet of the bladder. Any operation or treatment in that area heals by forming scar, and in some men that scar tightens enough to obstruct the flow of urine. It is most common after radical prostatectomy and transurethral prostate surgery, and it is often more stubborn after radiation. The good news is that it is treatable, and even contractures that have come back after earlier treatment can usually be repaired durably.
What Is the Bladder Neck?
The bladder neck is the funnel-shaped outlet at the bottom of the bladder, where urine leaves the bladder and enters the urethra. The prostate normally sits just below it. Because every prostate treatment works right at this junction, the bladder neck is where healing scar tends to form.
Why Prostate Surgery Can Lead to Scar
A bladder neck contracture can follow several different treatments, and the way it forms differs slightly with each:
- Radical prostatectomy. When the prostate is removed for cancer, the bladder is sewn directly to the urethra. Scar can form at this join (the anastomosis) and narrow it. This is sometimes called a vesicourethral anastomotic stenosis.
- Transurethral prostate surgery. Procedures such as TURP and laser treatments for an enlarged prostate remove tissue from the inside. The raw surface heals with scar, which can contract and narrow the bladder neck itself.
- Radiation therapy. Radiation for prostate cancer, alone or after surgery, can cause contractures, and radiation-associated scar tends to be denser and more likely to return after simple treatment.
- Earlier bladder neck or urethral surgery. Each procedure in the area adds scar, and the risk increases with repeated procedures.
A contracture may appear within months of treatment or develop years later, and it can progress over time. Most men who have prostate surgery never develop one; when it happens, it is a problem of how the tissue healed, not a sign that the cancer has returned.
Symptoms to Watch For
- A weak or slow urinary stream
- Difficulty starting urination, or straining to void
- A feeling that the bladder does not empty completely
- Recurrent urinary tract infections
- Inability to urinate at all (urinary retention), which needs prompt medical attention
Many men also have some leakage after prostate surgery. A contracture and stress incontinence can exist together, and when they do, treatment is planned with both in mind.
How Is It Treated?
Treatment depends on how tight the scar is, how many treatments have come before, and whether there has been radiation or there is also incontinence:
- Endoscopic incision with mitomycin C. Through a scope, with no skin incision, the scar is cut open with a cold knife and mitomycin C, a medication that slows scar formation, is injected into the incisions. Success ranges from 76–94%, depending on whether there has been prior pelvic radiation. A catheter typically stays in for 3–7 days, and most men return to normal activity within 1–2 weeks.
- Robotic reconstruction (Y-V plasty). When the bladder neck is completely closed off, or endoscopic treatment has failed, the bladder neck is rebuilt robotically. A Y-shaped incision opens the narrowed segment, and a V-shaped flap of healthy bladder is advanced into the opening, widening it with living tissue. In experienced hands, success is 75–90%, depending on patient factors.
- A staged artificial urinary sphincter, if needed. Opening the scar can unmask stress incontinence, because the sphincter was often weakened by the original prostate treatment. If that happens, an artificial urinary sphincter is placed in a separate, later operation once the bladder neck has healed and stays open.
You can see each of these treatments step by step in the interactive 3D bladder neck contracture atlas, and how an artificial urinary sphincter works in the male incontinence atlas.
Why Repeated Dilation Is Not the Answer
Stretching or cutting the scar again and again tends to create more scar. Repeated endoscopic procedures carry diminishing returns, with failure rates exceeding 80% for recurrent contractures after multiple prior treatments. If a contracture has come back more than once, that is usually the point to consider reconstruction rather than another short-term fix.
The Bottom Line
Bladder neck contractures form because the tissue around the bladder outlet heals with scar after prostatectomy, transurethral prostate surgery or radiation. They cause a weak stream, straining and incomplete emptying, and they can return after simple treatment. Endoscopic incision with mitomycin C works well for many men; for contractures that are completely closed or keep coming back, robotic reconstruction offers a durable repair. Men with recurrent, radiation-associated or complex contractures, especially those who also have incontinence, benefit from evaluation at a high-volume reconstructive center where every option is routinely performed.
This article is for educational purposes and is not a substitute for an individual medical evaluation. Reviewed by Alex J. Vanni, MD, FACS. Last updated September 20, 2026.
Considering Treatment for a Bladder Neck Contracture?
Dr. Vanni treats primary, recurrent and radiation-associated bladder neck contractures for patients from across New England and nationwide.
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