Hydronephrosis and Ureteronephrosis: What It Means on Your Kidney Ultrasound

If your report mentions hydronephrosis or ureteronephrosis, here it is in plain words.

What they mean

Hydronephrosis is dilation of the kidney from urine buildup ("hydro" = water, "nephro" = kidney). If the ureter dilates too, it's called ureteronephrosis.

How it looks and is graded

Ultrasound shows dilated kidney cavities. It's described in grades (mild, moderate, severe) by how much they dilate.

Common causes

Obstruction to urine flow, such as a stone (lithiasis), is a typical cause.

The method's view

Imaging shows the urinary system in real time, with no radiation.

Educational content to help you understand your report. Not a diagnosis and not a substitute for your doctor/radiologist, who sees the full image.