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Abstract #4678

The Diagnostic Accuracy of MR Imaging for Acute Pyelonephritis

Amarpreet Bhowra1, Iva Petkovska2, Diego Martin1, and Bobby Kalb1

1Medical Imaging, University of Arizona, Tucson, AZ, United States, 2Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, United States

MRI may offer a valuable alternative imaging method to diagnosing acute pyelonephritis without exposing patients to ionizing radiation or iodinated CT contrast. Our retrospective study evaluates the accuracy of 4 characteristic MRI findings in diagnosing acute pyelonephritis: (1) T2 hyperintense perinephric edema, (2) loss of corticomedullary differentiation on T2 images, (3) striated nephrogram on contrast-enhanced images, and (4) parenchymal restricted diffusion. Analysis of 108 MRI exams demonstrated that each of the 4 MRI findings was a significant predictor of pyelonephritis. Furthermore, assessing all 4 findings together provided a greater improvement in diagnostic accuracy when compared to any individual finding alone.

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