The roentgenographic findings of acute renal carbuncle observed in 6 patients are described. Basically, these findings consisted of: 1. Interstitial disease associated with perirenal involvement demonstrated on preliminary studies; 2. No mass displacement of the vessels in the involved area on angiography despite the suggestion of a mass on the earlier examinations; 3. Loss of the cortico-medullary junction on the nephrogram. The early diagnosis of acute carbuncle is essential since prompt therapy may salvage the kidney. With the ever increasing problem of drug addiction and its associated complications, acute renal carbuncle is slowly becoming a common disease of youth.