Acute pyelonephritis on radionuclide scan

Renal scintigraphy with 99Tc-DMSA in a patient with acute pyelonephritis showing large defects in the upper and lower poles of the right kidney (which is on the right side in this view). Note smaller defects in the lower and upper pole of the left kidney, indicating that pyelonephritis, although clinically right sided, was in fact bilateral.