Neoureterostomy

Neoureterostomy is the treatment of choice for ectopic ureter, a congenital (birth-present) abnormality seen more commonly in dogs than cats, and more often in females. Signs that prompt evaluation include:

• Continuous or near-constant urine dribbling from a young puppy or kitten (often present since birth or weaning)
• Wet fur around the vulva or inside the thighs that persists despite normal posturing to urinate
• Recurrent urinary tract infections related to urine pooling in an abnormal location

Medical management with medications that tighten the urethral sphincter can help some patients partially, but surgery is the only way to correct the anatomical problem. Certain breeds — Labrador Retrievers, Golden Retrievers, Siberian Huskies — are predisposed.

Neoureterostomy is performed under general anesthesia with full monitoring. The surgeon opens the abdomen and, if the bladder and ureteral junction are involved, opens the bladder as well. The main steps include:

• The ectopic ureter is identified and its abnormal attachment is carefully freed
• A new opening is created in the appropriate location on the bladder wall, well above the internal urethral sphincter
• The ureter is tunneled through the bladder wall at the new site and secured with fine absorbable sutures, creating a secure, anti-reflux connection
• The original abnormal tunnel or opening is closed
• The bladder and abdomen are closed in layers

In some centers, cystoscopy-guided laser ablation offers a minimally invasive alternative for intramural ectopic ureters. Your surgeon will discuss which approach best suits your pet's anatomy based on pre-operative imaging.

Because ectopic ureter is often associated with additional urinary abnormalities, thorough imaging before surgery is essential:

• CT urogram (CT scan with contrast that highlights the urinary tract) to map exactly where both ureters open and whether other abnormalities such as hydroureter or hypoplastic bladder are present
• Cystoscopy (bladder scope) may be combined with CT to evaluate the urethra and bladder interior directly
• Urinalysis and urine culture to identify and treat any active infection before surgery
• Pre-anesthetic bloodwork to confirm kidney function and overall health
• Food withheld the night before; water typically allowed until a few hours prior

Most pets are hospitalized for one to two days for IV fluid support and monitoring. Recovery at home generally follows this timeline:

• Days 1–7: a urinary catheter may be in place for the first day or two; strict rest, pain control, and monitoring for normal urination once the catheter is removed
• Weeks 1–2: leash-only activity; incision monitored for discharge or swelling
• 2 weeks: recheck visit for suture removal and urinalysis
• 1–3 months: gradual assessment of continence improvement — some improvement in leakage may occur over several weeks as the bladder and sphincter adapt

It is important to note that a subset of patients — particularly those with a very small (hypoplastic) bladder or concurrent urethral sphincter mechanism incompetence — may have partial rather than complete resolution of leaking even after anatomically successful surgery. Your surgeon will discuss realistic expectations based on your pet's full evaluation.

Neoureterostomy is a technically demanding procedure but carries a good success rate in experienced hands. Possible risks and considerations include:

• Ureteral narrowing (stricture) at the new attachment site — uncommon but requires monitoring with imaging or cystoscopy
• Persistent urine leakage — occurs in some patients due to concurrent bladder or sphincter abnormalities rather than a surgical failure
• Urine reflux from the bladder back up toward the kidney — mitigated by the anti-reflux tunnel technique
• Urinary tract infection — managed with antibiotics guided by culture results

Overall, most patients see significant improvement in continence, and in those with residual leakage, medications targeting the urethral sphincter often provide additional help.