Huang and Tseng classified findings of emphysematous pyelonephritis seen in CT scans of the abdomen. The authors are from the National Cheng Kung University Hospital in Tainan, Taiwan.
Parameters:
(1) number of kidneys present
(2) renal involvement
(3) pattern of gas bubbles
Kidneys Present
Kidney Involvement
Pattern of Gas Bubbles
Class
2
unilateral
in collecting system only (emphysem-atous pyelitis)
1
2
unilateral
in renal parenchyma but not in perinephric space
2
2
unilateral
in perinephric space with or without abscess
3A
2
unilateral
in pararenal space with or without abscess
3B
2
bilateral
any
4
1 (solitary)
unilateral
any
4
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