What is renal pelvis dilatation?
Renal pelvis dilatation (or hydronephrosis) is a widening of the renal pelvis and is a common finding on ultrasound scans (USS) performed during pregnancy. Often it is temporary and not associated with any problems in the kidney or ureter. In this situation, there is no risk for your child’s future health. However, in a small proportion of cases, hydronephrosis can be a sign of problems involving the kidneys, ureters, bladder, or the urethra (tube through which urine leaves the bladder). The two most common conditions are Pelviureteric Junction (PUJ) Obstruction and Vesicourethral Reflex (VUR). • PUJ Obstruction: a partial obstruction at the junction between the renal pelvis and the ureter which can restrict the flow of urine to the bladder. If the obstruction is severe, it can stop the kidney from working normally. • VUR: urine travels down the ureter to the bladder. The junction of the ureter and the bladder normally closes when the bladder contracts in preparation for passing urine
