Renal papillary necrosis CT

CT urography is helpful in the diagnosis of renal papillary necrosis that shows multiple small accumulations of contrast media in the papillary regions near the calyx system.

• CT urography is helpful in the diagnosis of renal papillary necrosis. ^[1]
  • Normal papillary blush is blushlike hyperattenuated area at excretory phase of CT urography. ^[1]
  • Findings on CT urography suggestive of renal papillary necrosis include multiple small accumulations of contrast media in the papillary regions. ^[1]
  • The lobster claw sign is a diagnostic finding on CT urography in the papillary subtype of renal papillary necrosis that develops due to elongation of the minor calyx fornices following ischemia and destruction of the renal papilla. ^[2]
  • Other diagnostic findings include^[3]:
    • ball on tee
    • signet ring
    • sloughed papilla with calyces clubbing