CT features of emphysematous pyelonephritis differentiates into two types

• type 1 -
  • renal parenchymal destruction with streaky or mottled appearance of gas.
  • intra- or extrarenal fluid collections are characteristically absent.
  • it is usually more aggressive and lead to death shortly, if not intervened early.
• type 2 - renal or extrarenal collections associated with bubbly or loculated gas, or gas within pelvicalyceal system or ureter.