Ultrasonogram has become a routine imaging modality to diagnose congenital anomalies.
Hydronephrosis is one of the common anomaly detected in the fetus
Incidence of antenatally  detected  hydronephrosis 2 – 4 %
Antenatal diagnosis of hydronephrosis causes a significant distress to the parents during pregnancy.
Antenatal counseling is being done regularly these days.
It is important to know the natural history of the disease to give the parents an idea of what they can expect .
The existing literature on the outcome of antenatal hydronephrosis are unclear.

To asses the outcome of antenatally diagnosed hydronephrosis in our series of patients.
To find out which children would require early surgical intervention, and who would require follow up evaluation.
To create a guideline for antenatal counseling based on our findings

Materials and methods
The study was conducted for 5 years from 2003 to 2008.
All the patients who were seen in our hospital with antenatally diagnosed hydronephrosis were included in  the study.

Materials and methods
The patients were followed up throughout the course of pregnancy and after birth.
Post natal evaluation included ultrasound (1-3 monthly)
Whenever indicated MCU, DTPA performed
Patients were followed from 1 to 4 years with a median follow up of 2.4 years.

Patient Groups
The patients were divided into two groups based on fetal USG,
Group I - Isolated unilateral hydronephrosis.
Group II – Hydroureter, bilateral involvement, bladder wall thickening.
The outcome between groups were compared.

Group 1: Isolated fetal hydronephrosis
Vast majority are minimal hydronephrosis which resolve spontaneously
Only 9% require surgery

Group II: Ureterohydronephrosis, Bilateral etc
55% required intervention
PUV, VUJ, Ureterocele etc

The parents of fetuses with isolated fetal hydronephrosis could be favorably counselled.

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