Home | Patient Info | Conditions / Procedures | Bladder Neck Incision (BNI)

Bladder Neck Incision (BNI)

What is a Bladder Neck Incision?

A bladder neck incision (BNI), also known as a transurethral incision of the bladder neck (TUIBN), is a minimally invasive procedure used to treat bladder outlet obstruction caused by a tight or narrowed bladder neck. The bladder neck is the area where the bladder joins the urethra, and when it does not open properly during urination, it can restrict urine flow and cause troublesome urinary symptoms.

Unlike procedures that remove prostate tissue, a bladder neck incision involves making one or two small cuts in the bladder neck to widen the opening and improve urine flow. It is most commonly recommended for men with a small prostate and primary bladder neck obstruction.

What are the Benefits of a Bladder Neck Incision?

A bladder neck incision can provide effective relief from urinary obstruction without removing prostate tissue.

Benefits include:

  • Improves urine flow
  • Relieves bladder outlet obstruction
  • Reduces urinary frequency and urgency
  • Helps the bladder empty more completely
  • Short procedure with no external incisions
  • Usually performed as a day-case or overnight stay
  • Faster recovery than more extensive prostate surgery
  • Preserves surrounding prostate tissue

When is a Bladder Neck Incision Recommended?

Your urologist may recommend a bladder neck incision if urinary symptoms are caused by a tight bladder neck rather than an enlarged prostate.

Common indications include:

  • Primary bladder neck obstruction
  • Slow or weak urinary stream
  • Difficulty starting urination
  • Incomplete bladder emptying
  • Recurrent urinary retention
  • Small prostate causing bladder outlet obstruction
  • Persistent lower urinary tract symptoms despite medication
  • Bladder outlet obstruction confirmed by urodynamic testing or cystoscopy

This procedure is generally most suitable for younger men or those with relatively small prostates.

What does Preparation for a Bladder Neck Incision Involve?

Before surgery, your urologist will assess your symptoms and confirm that a bladder neck incision is the most appropriate treatment.

Preparation may include:

  • Medical history and physical examination
  • Urine test to exclude infection
  • Blood tests
  • Measurement of urine flow rate (uroflowmetry)
  • Bladder scan to assess residual urine
  • Flexible cystoscopy
  • Urodynamic studies in selected patients
  • Review of current medications, including blood-thinning medicines
  • Fasting before surgery
  • Discussion of the procedure, recovery, and possible risks

How is a Bladder Neck Incision Performed?

A bladder neck incision is usually performed under general or spinal anaesthetic and typically takes between 20 and 40 minutes. The surgeon inserts a thin telescope called a resectoscope through the urethra into the bladder, so no external incision is required. Using a specialised electrical or laser instrument, one or two precise incisions are made at the bladder neck to release the tight ring of muscle and widen the outlet from the bladder.

Unlike a transurethral resection of the prostate (TURP), no prostate tissue is removed. Instead, the small incisions allow the bladder neck to open more freely during urination, improving urine flow while preserving the surrounding structures.

At the end of the procedure, a urinary catheter is usually inserted to drain the bladder while the treated area begins to heal. The catheter is commonly removed later the same day or the following morning, depending on the amount of urine drainage and any postoperative bleeding.

What to Expect during Recovery after a Bladder Neck Incision?

Most patients return home the same day or after an overnight hospital stay.

During recovery, you may experience:

  • Mild burning when passing urine
  • Increased urinary frequency for several days
  • Small amounts of blood in the urine
  • Temporary urinary urgency
  • Gradual improvement in urine flow over several weeks
  • Return to light activities within a few days
  • Avoidance of heavy lifting and strenuous exercise for two to four weeks

Drinking plenty of fluids during the early recovery period helps flush the bladder and reduce the risk of blood clots forming in the urine.

Follow-up appointments are arranged to assess symptom improvement and ensure the bladder is emptying effectively.

What are the Risks and Complications of a Bladder Neck Incision?

Bladder neck incision is a safe and well-established procedure, but all surgery carries some potential risks.

Possible complications include:

  • Bleeding
  • Urinary tract infection
  • Temporary difficulty passing urine
  • Burning or discomfort during urination
  • Retrograde ejaculation (dry orgasm)
  • Recurrence of bladder neck narrowing
  • Urinary incontinence, although uncommon
  • Injury to the bladder or urethra, which is rare
  • Need for repeat treatment if symptoms recur
  • Anaesthetic-related complications

Your urologist will explain whether a bladder neck incision is the most appropriate treatment for your urinary symptoms, discuss the expected benefits and possible risks, and provide personalised advice to support a smooth recovery and improved bladder function.