DMSA scan is used to see the functional anatomy of the kidney and is also called renal cortical scintigraphy. The common indications for this scan are acute pyelonephritis, renal scarring, Solitary or ectopic renal tissue and horseshoe kidneys. The clinical conditions for this scan are detection of the cortical defects of acute pyelonephritis and scarring related to chronic pyelonephritis. This scan is very sensitive and detects cortical scarring with twice as many defects as ultrasound and 4 times as intravenous urography. When detected early and satisfactorily treated, the loss of function associated with acute pyelonephritis can be reversed without scar formation.