UPJ Obstruction Surgery in Turkey

The kidney produces urine; urine first collects in small chambers inside the kidney (the calyces), then gathers in a funnel-shaped chamber, the renal pelvis, and from there travels down a thin channel called the ureter to the bladder. The point where the pelvis opens into the ureter is called the ureteropelvic junction (UPJ; sometimes written PUJ, or "UP junction," in reports). If the passage at this point is narrow or unable to contract, urine backs up, and the pelvis and calyces widen. This is where the everyday name "kidney outlet narrowing" comes from.

In children, UPJ obstruction is almost always congenital; it has nothing to do with anything done or not done during pregnancy, feeding, or infant care. Three structural types underlie the narrowing, and more than one can be present together in the same child. Which type predominates affects less the treatment method itself and more how the operation is planned.

In infants, UPJ obstruction usually causes no symptoms at all; the diagnosis is made from hydronephrosis seen on a prenatal or post-birth ultrasound. Less often, a febrile urinary tract infection, a soft mass felt in the abdomen (a very widened pelvis), unexplained fussiness, or vomiting and poor weight gain can be the first clue. This is why, in infants, the decision rests on ultrasound and MAG3 findings rather than symptoms.

Diagnosis proceeds in steps, and each step seeks an answer to two questions: what is causing the widening, and is the kidney being harmed? The usual order is ultrasound, VCUG if needed, then MAG3, and MR urography in selected cases. Not every child needs every test; which one is requested, and when, depends on the picture on ultrasound.

Ultrasound reports describe widening in three different languages: the AP diameter in millimeters, the SFU grade (0–4), and the UTD classification (P1–P3). According to guidelines, none of these systems is superior to the others on its own; your doctor interprets all of them together, along with your child's age and other findings. Here are the basic definitions.

The MAG3 report answers two basic questions: what percentage of the total workload is this kidney doing (split, i.e. divided function), and how fast does the pelvis empty after a diuretic is given (drainage, T½)? The two are read side by side with ultrasound and symptoms; no single number decides on its own.

This is the question families ask most, and the honest answer is this: the decision isn't made from a single threshold, but from how three things behave over time — the course of the widening on ultrasound, function and drainage on MAG3, and the child's symptoms. Guidelines list surgical criteria, but the strength of these recommendations is graded "weak" — meaning each one carries weight, but none is a command on its own.

Conservative follow-up is not "wait and see" — it's a planned monitoring program. Most children with good function, no symptoms, and a stable kidney on ultrasound proceed along this path. The goal is two-fold: sparing a child who will improve on their own from unnecessary surgery, and catching in time a kidney that is starting to lose function.

Pyeloplasty is the repair operation for UPJ obstruction. The gold-standard technique is Anderson–Hynes (dismembered) pyeloplasty: the narrow or non-contracting segment is completely removed, an overly widened pelvis is reduced if needed, and the end of the ureter is widened and re-sewn to the lowest point of the pelvis with a wide, funnel-shaped opening. If a crossing vessel is present, it is preserved and the ureter is moved in front of it. In this way, all three structural types of the narrowing are corrected in the same operation.

All three approaches perform the same repair on the inside; the difference is how the kidney is reached. Guidelines find the success and complication rates of open, laparoscopic and robotic pyeloplasty comparable. With minimally invasive methods, the hospital stay is shorter, there's less pain, and the cosmetic result is better; the choice of method depends largely on the center's experience.

The post-operative period has three parts: the first days in the hospital, recovery at home, and long-term check-ups. In the hospital, pain control, resuming feeding, and monitoring any drain and urinary catheter come first. After discharge, you're given a written plan for wound care, bathing, activity, and returning to school.

In adolescents, UPJ obstruction mostly shows up as episodic flank pain, and a crossing vessel is more common at this age. Attacks triggered by sports, heavy fluid intake, or vigorous activity should raise suspicion for the diagnosis. Laparoscopic or robotic pyeloplasty is the common choice at this age; post-operative pain resolves in the large majority. Keeping follow-up uninterrupted through the transition from adolescence to adulthood matters, especially for those operated on in childhood.