Why has fetal renal pelvis dilatation in my one expectant twin left kidney only occurred at 32weeks gestation?

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Why has fetal renal pelvis dilatation in my one expectant twin left kidney only occurred at 32weeks gestation?

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doubletrouble, According to the medical college at Cornell University, hydronephrosis is detected in about 1.4 percent of fetuses who received sonograms. It is the most common fetal anomaly and accounts for about 50 percent of all findings. Hydronephrosis in infants is a result of a genetic anomaly. The most common cause is UPJ (ureteropelvic junction) obstruction that results from a narrowing of the ureter as it descends from the kidney. Another cause of hydronephrosis is urine reflux, known as vesicoureteral reflux (VUR) – which is the abnormal flow of urine from the bladder back into the ureters caused by problems with valves in the ureters that control the flow of urine, shown on postnatal voiding cystourethrography (VCUG) x-ray examination of the bladder and urethra that is performed while the bladder is emptying. Mild hydronephrosis, sometimes called dilated renal pelvis (DRP) or pyelectesis, is a common finding on antenatal ultrasound scans. When confined to the renal pelvis and

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