Chronic pyelonephritis- atrophic kidney:

This adult male patient had recurrent calculi in the right kidney. Ultrasound video clip (long axis view) of the right kidney shows:

 

Note the small right kidney with irregular contour suggesting chronic infection/ pyelonephritis.

  

Color Doppler video clip of right kidney shows poor vascularity in the right kidney, again confirming atrophic changes and poor functionality in this kidney.

 

The normal left kidney is shown for comparison in this color Doppler ultrasound video clip. There is a certain degree of compensatory hypertrophy in this kidney.