Hydronephrosis of one kidney is most commonly caused by an incomplete blockage at the junction between the kidney urine collecting system, and the urine drain pipe (pelvicalyceal system and ureter). This is called a PUJO. This is an in-born condition and is not known to be inherited or related to food or behaviour during pregnancy.
Other causes of hydronephrosis include the backflow of urine from the bladder into the kidneys or a blockage of the lower end of the ureter.
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