Hydronephrosis

A distention and dilation of the renal pelvis, usually caused by obstruction of the free flow of urine from the kidney.

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Hydronephrosis

Hydronephrosis usually develops over just a few hours when a blockage forms quickly - from a kidney stone for example. But it can develop gradually over a period of weeks or months if the blockage is due to something like a slow-growing tumour.

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Hydronephrosis

Hydronephrosis commonly results from an obstruction located at the junction of the ureter and renal pelvis. Causes of this type of obstruction include the following:

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Hydronephrosis

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In acute hydronephrosis, urine that has accumulated above the obstruction is drained as soon as possible, usually with a needle inserted through the skin into the kidney. The goals of this urgent drainage are to prevent loss of kidney function or prevent further loss if function is already impaired. The obstruction must also be relieved quickly. The method used depends on the cause, but most obstructions require surgery of some kind. For example, surgery may be needed to remove a stone from the renal pelvis or the ureter.

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Hydronephrosis

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