Table 3.

Validity of DW MR imaging in comparison with CECT in detection of APN

Site of APN	Sensitivity	Specificity	Positive predictive value	Negative predictive value	Percentage of false positive	Percentage of false negative
Right upper pole	96.6%	88.9%	89.6%	95.2%	10.3%	4.7%
Right middle pole	100%	90.2%	88%	100%	12%	0%
Right lower pole	96%	92%	92.3%	95.8%	7.6%	4.1%
Left upper pole	96.4%	89.6%	90%	95%	10%	5%
Left middle pole	96.6%	90%	93.5%	94.7%	6.4%	5.2%
Left lower pole	100%	90.2%	88.4%	100%	11.5%	0%

APN – acute pyelonephritis, CECT – contrast-enhanced computed tomography, DW MR – diffusion-weighted magnetic resonance.