These techniques have a sensitivity of 73% to 100%, specificity of 82% to 99%, and negative predictive value of 88% to 100% for the diagnosis of >50% renal artery stenosis [19,20]. Renal Failure MRI Abdomen and Pelvis MRI with IV contrast is generally not indicated in AKI. Unenhanced MRI may be used to evaluate extent and cause of suspected distal urinary tract obstruction. However, there is no relevant literature regarding the use of MRI abdomen and pelvis without IV contrast in the evaluation of AKI. There is no relevant literature regarding the use of MRI abdomen and pelvis without and with IV contrast in the evaluation of AKI. MRI with IV contrast is generally no t indicated in AKI. However, acute cortical necrosis can be specifically diagnosed when there is a low T2 signal rim at the corticomedullary junction and absence of cortical enhancement [23]. MR Urography There is no relevant literature regarding the use of MRU in the evaluation of AKI. However, a nonenhanced contrast MRU may provide additional information in patients with renal failure secondary to obstruction. Radiography Abdomen and Pelvis There is no role for radiography in AKI, other than for evaluation of renal stone disease, which acknowledges that radiography is less sensitive than CT for stone disease [24]. DMSA Renal Scan Tc-99m dimercaptosuccinic acid (DMSA) scintigraphy is ideal for functional renal cortical imaging and is most useful for detection of focal renal parenchymal abnormalities and scars in the setting of acute or chronic pyelonephritis or for differential renal function. There is no relevant literature regarding its use in the evaluation of AKI. MAG3 Renal Scan Tc-99m mercaptoacetyltriglycine (MAG3) is the most frequently used renal tubular agent, specifically to quantify renal tubular extraction. Its rate of clearance can be used as an independent measure of renal function.
Renal Failure. These techniques have a sensitivity of 73% to 100%, specificity of 82% to 99%, and negative predictive value of 88% to 100% for the diagnosis of >50% renal artery stenosis [19,20]. Renal Failure MRI Abdomen and Pelvis MRI with IV contrast is generally not indicated in AKI. Unenhanced MRI may be used to evaluate extent and cause of suspected distal urinary tract obstruction. However, there is no relevant literature regarding the use of MRI abdomen and pelvis without IV contrast in the evaluation of AKI. There is no relevant literature regarding the use of MRI abdomen and pelvis without and with IV contrast in the evaluation of AKI. MRI with IV contrast is generally no t indicated in AKI. However, acute cortical necrosis can be specifically diagnosed when there is a low T2 signal rim at the corticomedullary junction and absence of cortical enhancement [23]. MR Urography There is no relevant literature regarding the use of MRU in the evaluation of AKI. However, a nonenhanced contrast MRU may provide additional information in patients with renal failure secondary to obstruction. Radiography Abdomen and Pelvis There is no role for radiography in AKI, other than for evaluation of renal stone disease, which acknowledges that radiography is less sensitive than CT for stone disease [24]. DMSA Renal Scan Tc-99m dimercaptosuccinic acid (DMSA) scintigraphy is ideal for functional renal cortical imaging and is most useful for detection of focal renal parenchymal abnormalities and scars in the setting of acute or chronic pyelonephritis or for differential renal function. There is no relevant literature regarding its use in the evaluation of AKI. MAG3 Renal Scan Tc-99m mercaptoacetyltriglycine (MAG3) is the most frequently used renal tubular agent, specifically to quantify renal tubular extraction. Its rate of clearance can be used as an independent measure of renal function.