Table 1.

(A) Case reports of emphysematous pyelonephritis (EPN)
		age		sex		DM		renal function		laterality		gas within the cyst		gas within the parenchyma		bacteria		drainage		urgent nephrectomy		nephrectomy		outcome		reference
1		47		F		unknown		Cr 4.5 mg/dL		right		-		+		E. coli		-		-		+		recover		2
2		51		M		+		HD		bilateral		-		+		E. coli		-		+		+		recover		3
3		50		F		+		unknown		bilateral		unknown		unknown		unknown		-		-		-		recover		4
4		64		M		+		Cr 5.9 mg/dL		bilateral		-		+		E. coli		-		-		-		recover		5
5		44		M		+		Cr 2.9 mg/dL		left		-		+		unknown		+		-		-		recover		6
6		51		F		+		Cr 3.1 mg/dL		right		-		+		E. coli		-		+		+		recover		7
7		76		F		+		PD		right		-		+		E. coli		-		-		+		recover		8
8		42		M		+		post transplant		bilateral		-		+		E. coli		-		-		+		recover		9
9		43		M		-		HD		bilateral		+		+		E. coli		-		-		+		recover		10
10		51		M		-		HD		right		+		+		E. coli		-		-		+		recover		11
11		57		M		+		Cr 1.3 mg/dL		bilateral		+		+		E. coli		+		-		-		recover		12

(B) Case reports of emphysematous polycystic renal infection (EPRI)
		age		sex		DM		renal function		laterality		gas within the cysts		gas within the parenchyma		bacteria		drainage		urgent nephrectomy		nephrectomy		outcome		reference
1		65		F		unknown		post transplant		right		+		-		clostridium perfringens		-		+		+		recover		13
2		40		M		unknown		HD		right		+		-		unknown		-		+		+		death		14
3		57		M		-		ESRD		right		+		-		E. coli		-		+		+		death		15
4		62		F		-		HD		left		+		-		E. coli		+		-		-		recover		16
5		61		M		-		PD		left		+		-		klebsiella pneumoniae		-		-		-		recover		17
6		44		F		-		ESRD		right		+		-		E. coli		+		-		+		recover		present study

DM: Diabetes mellitus, HD: Hemodialysis, ESRD: End stage renal disease, PD: Peritoneal Dialysis, E. coli: Escherichia coli