<prompt> Necrotizing papillitis is a feature in all of the following conditions except -Sickle cell diseaseTuberculous pyelonephritisDiabetes mellitusAnalgesic nephropathy  <response>: Necrotizing papillitis or papillary necrosis: It is one special pattern of acute pyelonephritis and is much more frequent in diabetics compared to nondiabetics. Hyaline aeriolosclerosis narrows blood vessels - reduces the blood supply to the renal medulla - ischemia -causes necrosis of the tips of papillae papillary necrosis. Causes of necrotizing papillitis: Diabetes mellitus Sickle cell anemia Analgesic nephropathy Obstructive uropathy. Ref: RAM DAS NAYAK EXAM PREPARATORY MANUAL FOR UNDERGRADUATES 2nd ed. pg no: 615 