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Understanding This Report - Baby Rithan Raj (7 Months, 29 Days)
What Test Was Done?
This is a 99m-Tc-EC Dynamic Renal Scintigraphy - a nuclear medicine scan that uses a tiny amount of a radioactive tracer injected into the bloodstream to measure:
- How well each kidney filters blood
- How well each kidney drains urine
The scan was done at Meenakshi Mission Hospital, Madurai on 27-04-2026. The reason was "bilateral PUJO" - meaning both kidneys are suspected to have a blockage where the kidney meets the tube (ureter) that drains urine down to the bladder.
What Is PUJO? (The Core Problem)
PUJO = Pelvi-Ureteric Junction Obstruction
Think of the kidney like a funnel collecting urine. At the narrow end of that funnel (called the pelvis), a tube called the ureter begins and carries urine down to the bladder. In PUJO, there is a narrowing or partial blockage at this junction - so urine doesn't drain freely. It backs up inside the kidney, causing it to swell (called hydronephrosis).
In this baby, BOTH kidneys have this problem - that is what "bilateral" means.
What the Report Found (Finding by Finding)
| Parameter | Left Kidney | Right Kidney | What It Means |
|---|---|---|---|
| Size | Normal | Normal | Both kidneys are a normal size for age - good |
| Shape | Minimally hydronephrotic | Minimally hydronephrotic | Both kidneys are slightly swollen with backed-up urine - mild |
| Position | Normal | Normal | Kidneys are where they should be |
| Perfusion | Normal | Normal | Blood supply to both kidneys is good |
| Parenchymal function | Normal | Normal | The kidney tissue (the part that actually filters) is working normally |
| Parenchymal transit | Normal | Normal | The tracer moves through kidney tissue at a normal speed |
| PCS and drainage | Adequate drainage into bladder | Adequate drainage into bladder | Both kidneys ARE draining - the blockage is not complete |
| Ureter | Not dilated | Not dilated | The tubes below the kidneys are normal - blockage is at the top |
| Time to peak | 2.23 mins | 1.73 mins | How fast the tracer reaches maximum concentration - both are reasonable |
| Renogram pattern | Adequate drainage | Adequate drainage | The drainage curve looks acceptable |
| Split function | 49% | 51% | How much work each kidney is doing - almost perfectly equal (ideal is 50/50) |
| Split ERPF | 197.41 ml/min | 208.87 ml/min | Each kidney's filtering capacity individually |
| Total ERPF | 406.28 ml/min | - | Total = normal (normal range is 350-550 ml/min) |
The Most Important Numbers: ERPF
ERPF = Effective Renal Plasma Flow - this measures how much blood plasma the kidneys filter per minute. It is the main number to judge kidney health here.
- Total ERPF: 406.28 ml/min - this falls within the normal range of 350-550 ml/min
- Split: 49% Left, 51% Right - near-perfect balance between both kidneys
- This is a reassuring finding - despite the obstruction, both kidneys are currently functioning well
The Diagnosis (Impression)
The report concludes:
Both kidneys are minimally hydronephrotic with LOW GRADE pelvi-ureteric junction obstruction, but with good perfusion and function.
In plain terms:
- There IS a partial blockage at the junction where each kidney drains into the ureter
- The blockage is low grade (mild, not severe)
- Despite this blockage, both kidneys are currently working well
- The urine IS draining adequately - just not as freely as it should
Is This Serious? What Happens Next?
This is a mild/low-grade finding, which is actually a relatively good result. Here is what typically happens in such cases (based on standard urology guidelines):
Reassuring signs in this baby:
- Total ERPF is normal (406 ml/min)
- Split function is balanced (49%/51%)
- Drainage is adequate
- Shape is only "minimally" hydronephrotic (not severe swelling)
- Kidney tissue function is normal
What needs monitoring:
- Regular kidney ultrasounds (every 3-6 months) to check if the swelling is increasing or decreasing
- Repeat renal scans at intervals (3, 6, 12 months) to check if function is stable or deteriorating
- Watch for signs of urinary tract infections, which are more common when urine doesn't drain freely
When would surgery be needed?
Surgery (called pyeloplasty - widening the blocked junction) is recommended if:
- Kidney function drops (split function falls below ~40%)
- Swelling worsens significantly
- Recurrent infections occur
- The baby develops pain or other symptoms
The good news: Many cases in infants improve spontaneously within the first 18 months of life. Poor drainage in babies under 18 months can sometimes be temporary. Surgery has a ~95% success rate if needed.
Summary in Simple Terms
Your baby's kidneys both have a mild narrowing at the point where they drain urine into the tubes going to the bladder. This is causing both kidneys to be slightly swollen (hydronephrosis). However, the kidneys are still filtering blood well, draining adequately, and the total kidney function is within the normal range. This is a low-grade problem being closely monitored. The next steps will likely be regular ultrasounds and follow-up scans to make sure the situation is stable or improving, with surgery only if the kidneys start losing function or symptoms develop.
Important: This explanation is for educational understanding only. Please discuss the findings, follow-up plan, and any treatment decisions directly with the treating doctor (pediatric urologist or nephrologist) who knows the full clinical picture of your baby.
Treatment
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PUJO low grade infant treatment observation surgery antibiotics follow up
Here is a full breakdown of treatment options for this baby's condition:
Treatment for Baby Rithan Raj's Bilateral Low-Grade PUJO
The Good News First
This baby's scan shows low-grade obstruction with normal kidney function (Total ERPF 406 ml/min, split 49%/51%). This places him in the most favorable category - where watchful waiting (conservative management) is the first and appropriate approach. Surgery is NOT immediately needed.
TREATMENT PATH 1: Conservative (Watch and Wait) - Current Recommended Approach
Since both kidneys are working well and drainage is adequate, the standard approach is:
1. Regular Monitoring (Most Important)
| What | How Often | Why |
|---|---|---|
| Kidney Ultrasound | Every 3-6 months | Check if swelling is increasing or shrinking |
| Repeat Renal Scintigraphy (DTPA/MAG3 scan) | At 3, 6, and 12 months | Check if split function stays above 40% per kidney |
| Urine tests | At each visit | Detect silent urinary tract infections early |
| Blood pressure check | At each visit | Kidney problems can raise blood pressure |
Key number to watch: Split function must stay above 40% per kidney. Currently it is 49% (Left) and 51% (Right) - well above the safe threshold.
2. Antibiotic Prophylaxis (Infection Prevention)
Because urine doesn't drain freely, bacteria can grow more easily. Most doctors prescribe a low-dose daily antibiotic to prevent urinary tract infections (UTIs). Commonly used in infants:
- Trimethoprim (most common choice in young infants)
- Nitrofurantoin (after 3 months of age)
- Amoxicillin (for very young babies under 2 months)
This is given at 1/4 of the treatment dose, just once daily at bedtime - it is a preventive measure, not a treatment for active infection.
3. Watch for These Warning Signs (Go to Doctor Immediately)
- Fever without obvious cause (can signal kidney infection)
- Baby crying during urination, foul-smelling urine
- Poor feeding, vomiting, lethargy
- Abdominal swelling
TREATMENT PATH 2: Surgery - Only If Needed
Surgery is considered if any of the following develop:
| Trigger for Surgery | What It Means |
|---|---|
| Split function falls below 40% on repeat scan | Kidney is losing too much function |
| Worsening hydronephrosis on ultrasound | Obstruction is getting worse |
| Recurrent UTIs despite antibiotics | Infection cannot be controlled without fixing drainage |
| Symptoms - pain, vomiting, blood in urine | Obstruction is causing problems |
| Absolute solitary kidney with obstruction | Cannot afford to lose any function |
The Surgery: Pyeloplasty
The operation is called dismembered pyeloplasty (Anderson-Hynes procedure). It is the gold standard with ~95% success rate.
What is done:
- The narrowed/blocked part of the junction is cut out (removed)
- The ureter is reconnected to the kidney with a wider, properly shaped opening
- A small stent (tube) may be left temporarily to keep the new junction open while it heals
Surgical approaches available:
| Approach | Description | Best For |
|---|---|---|
| Open pyeloplasty | One incision in the flank/abdomen | Standard for young infants |
| Laparoscopic pyeloplasty | Small keyhole incisions, camera-guided | Children over 6-12 months |
| Robotic-assisted (RALP) | Robot-assisted keyhole surgery | Larger/older infants, specialized centers |
A 2024 meta-analysis (PMID 38065760) confirmed that open and minimally invasive pyeloplasty in infants have comparable success rates - the choice depends on the surgeon's experience and the baby's size.
Recovery: Typically 2-3 days hospital stay. A follow-up ultrasound at 3-6 months confirms success.
Reoperation rate is only 2-4% - outcomes are excellent.
What to Expect: The Natural Timeline
- About 50% of infants with PUJO can be managed conservatively without ever needing surgery
- Many cases in babies under 18 months improve spontaneously as the baby grows and the junction matures
- Those who do need surgery: most undergo it before age 4, with average age around 10-11 months
- Even after surgery, kidneys may look swollen on ultrasound for months to years - this is normal as long as function is good
Summary for This Baby
| Right Now | Next Steps |
|---|---|
| Both kidneys functioning normally | No surgery needed at this stage |
| Low-grade, adequate drainage | Start watchful monitoring |
| Good split function (49%/51%) | Repeat ultrasound in 3 months |
| Repeat renal scan in 3-6 months | |
| Daily low-dose antibiotic (as prescribed by doctor) | |
| Report any fever/UTI symptoms immediately |
Important reminder: The exact antibiotic, dosage, and follow-up schedule must be decided by the pediatric urologist or pediatric nephrologist managing this baby. Do not start or stop any medication without their guidance. This information is for educational understanding only.
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