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Prof. Dr. Ali Avanoğlu
UPJ Obstruction • After surgery and follow-up

Pyeloplasty Complications: Urine Leak, Infection, Stent Problems

Pyeloplasty is a safe, high-success operation, but like any surgery it carries possible risks. On this page we explain, in plain language, complications such as urine leak, infection, stent problems, bleeding and recurrent narrowing — how often they occur, and which symptoms mean you should see a doctor right away.

Who this is forFamilies wanting to understand the risks before surgery, and families facing a symptom after surgery
Reading≈5 min
ByProf. Dr. Ali AvanoğluUpdated
This page is part of UPJ obstruction.Read the full treatment overview on the hub page
KIDNEY END (COILED)sits in the pelvis, does not slipBLADDER END (COILED)floats free in the bladder4–6 WEEKSremoved afterward by cystoscopySEEK CARE IMMEDIATELYfever (≥38 °C)severe / persistent paininability to urinatedark bloody urine, clotsJJ (DOUBLE-J) STENT · WARNING SIGNS
JJ stent: kidney end in the pelvis, bladder end in the bladder, 4–6 weeks; warning signs requiring immediate care
01 · The general picture: risks are rare, but worth knowing02 · The first weeks: urine leak and infection03 · Stent- and drainage-related problems04 · Rarer problems: bleeding, injury to a nearby organ, recurrent narrowing05 · When you should see a doctor right away
In brief5 madde
  • The general picture: risks are rare, but worth knowing: Pyeloplasty (repair of UPJ obstruction, i.e.
  • The first weeks: urine leak and infection: A urine leak is a small amount of urine seeping into the surrounding tissue from the newly rejoined junction.
  • Stent- and drainage-related problems: The JJ (double-J) stent is the most common source of minor complaints: frequent urination, burning, mild bloody urine and flank pain when urinating are expected stent…
  • Rarer problems: bleeding, injury to a nearby organ, recurrent narrowing: Bleeding requiring a blood transfusion during or after surgery is rare in pediatric pyeloplasty.
  • When you should see a doctor right away: The symptoms below can be an early sign of a complication; contact us the same day without waiting for your appointment, or go to the nearest emergency department.
01

The general picture: risks are rare, but worth knowing

Pyeloplasty (repair of UPJ obstruction, i.e. ureteropelvic junction obstruction) is one of pediatric urology's well-defined, commonly performed operations; guidelines report roughly 90–95% success and above. The large majority of complications are temporary and resolve without lasting harm.

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  • According to guidelines, complication rates for the open, laparoscopic and robotic approaches are comparable; the differences show up more in hospital stay, pain and scarring. That's why the issues below should be known regardless of approach.
  • It helps families to think of complications by timing: those seen in the first days (bleeding, ileus, anesthesia-related issues), those seen in the first weeks (urine leak, infection, stent problems), and those seen months later (recurrent narrowing). Each has its own symptoms and its own solution.
02

The first weeks: urine leak and infection

A urine leak is a small amount of urine seeping into the surrounding tissue from the newly rejoined junction. Prolonged drain output, abdominal distension, or clear fluid from the wound suggest this. Most leaks close on their own with the stent and drain left in place; rarely, a catheter or temporary nephrostomy is needed.

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  • A febrile urinary tract infection (pyelonephritis) can occur, especially during the stent period. Fever, shivering, flank pain, vomiting and, in infants, not feeding are the symptoms. Caught early, it's treated with antibiotics; if drainage is inadequate, the stent may need to be checked.
  • Wound problems (redness, discharge, a stitch reaction) and post-operative sluggish bowels (ileus) can occur in the first days and usually resolve with simple measures. Anesthesia-related nausea and sore throat are short-lived.
03

Stent- and drainage-related problems

The JJ (double-J) stent is the most common source of minor complaints: frequent urination, burning, mild bloody urine and flank pain when urinating are expected stent symptoms and resolve once the stent is removed. These are not complications — they're the stent's natural effects.

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  • True stent problems are rarer: the stent shifting out of place, becoming blocked, accumulating a crust, or being left in too long. Migration can present as sudden flank pain and inability to pass urine; blockage comes with pain and fever. In either case, the stent is corrected or replaced with a short procedure.
  • If an externalized stent or nephrostomy was used, watch for the tube coming out, drainage stopping, or leaking around it. The symptoms of the stent period are covered under a separate heading.
04

Rarer problems: bleeding, injury to a nearby organ, recurrent narrowing

Bleeding requiring a blood transfusion during or after surgery is rare in pediatric pyeloplasty. In laparoscopic and robotic surgery, converting to an open operation is occasionally needed; this is not a failure but a safety decision, and is discussed in the consent process beforehand.

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  • Injury to a nearby organ (bowel, spleen, liver, pleura) is very rare and is usually noticed and repaired during surgery itself in experienced hands. When a crossing vessel is present, preserving it is a routine part of the operation.
  • The late problem families ask about most is the narrowing coming back. According to guideline data, the need for a repeat procedure is roughly 3–5%, and most cases show up in the first 1–2 years. What matters here is that a recurrent narrowing is fixable.
05

When you should see a doctor right away

The symptoms below can be an early sign of a complication; contact us the same day without waiting for your appointment, or go to the nearest emergency department. Most problems caught early are resolved simply.

  • Fever (38 °C/100.4 °F and above), shivering, flank pain: possible obstructed or infected kidney; needs same-day evaluation.
  • Increasing pain, vomiting, abdominal swelling or distension in the first weeks after surgery.
  • Discharge from the wound, widespread redness, or urine leaking from the wound.
  • With a stent or nephrostomy in place: fever, severe pain, dark bloody urine, the tube coming out, nephrostomy drainage stopping.
  • In a solitary kidney or bilateral hydronephrosis: reduced urine output, swelling, marked weakness.
  • In an infant: not feeding, excessive sleepiness, visible blood in the urine.
UPJ Obstruction video guide3 short videos, in order
Frequently asked questions
Is pyeloplasty a risky operation?
It's a commonly performed operation in pediatric urology with well-established safety and success. Most complications are temporary; serious problems like transfusion-requiring bleeding or organ injury are rare. Risks specific to your child are explained at the pre-operative consultation.
What happens if there's a urine leak?
Most leaks close on their own with the stent and drain left in place, sometimes with a catheter added. A temporary nephrostomy is rarely needed. Let your doctor know if drain output stays high for a long time, or if the abdomen becomes distended.
If the stent causes pain, is that a complication?
Frequent urination, mild burning, pink urine and flank pain when urinating are expected stent symptoms — not complications — and resolve once the stent is removed. Fever, severe pain, inability to pass urine, or dark bloody urine suggest a stent problem and need same-day evaluation.
Can the narrowing come back after surgery?
Rarely; the literature reports a need for a repeat procedure in roughly 3–5% of cases, usually in the first 1–2 years. This is why ultrasound follow-up continues. A recurrent narrowing can be fixed with redo pyeloplasty or endoscopic methods.
←Previous • After surgery and follow-upFollow-Up After PyeloplastyNext • After surgery and follow-upIf the Narrowing Comes Back: Redo Pyeloplasty→
Related pagesFull index →
After surgery and follow-upJJ (Double-J) StentA JJ (double-J) stent is a temporary, thin tube placed between the kidney and bladder after pyeloplasty; it keeps the newly rejoined junction open while it heals. How long it stays in a child, which symptoms are normal, and how it's removed are among the questions families ask most.After surgery and follow-upIf the Narrowing Comes Back: Redo PyeloplastyPyeloplasty is a single, lasting operation for most children; but in a small group, the narrowing comes back. This page explains why recurrent UPJ obstruction happens, how it's recognized, and which options exist — redo (repeat) pyeloplasty chief among them.After surgery and follow-upAfter Pyeloplasty: Care at HomeThe first days after pyeloplasty raise more questions for most families than the operation itself. This page walks through what happens in the hospital, what the drain and catheter are for, pain, feeding and wound care at home, and when you should call us right away.After surgery and follow-upFollow-Up After PyeloplastyFollow-up after pyeloplasty answers more than just "has the hydronephrosis gone away?" Ultrasound tracks the widening's course, and MAG3 tracks function and drainage when needed; a slow improvement in kidney swelling is expected, and success is defined by the overall course, not a single measurement.
See alsoVesicoureteral Reflux (VUR)Pyelonephritis in Children (Febrile UTI): Symptoms and When It's an Emergency
UPJ Obstruction topic clustersMain treatment page →
Basics 7Diagnosis and evaluation 6Follow-up or surgery? 7Conservative follow-up 5Pyeloplasty and approaches 7After surgery and follow-up 6By age, and special situations 7
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