MRI Abdomen Without and With IV Contrast There is limited evidence to support the use of MRI abdomen without and with IV contrast (separate from MRU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause. MRI Abdomen Without IV Contrast There is limited evidence to support the use of MRI abdomen without IV contrast (separate from MRU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause. MRU Without and With IV Contrast There is some evidence for use of MRU without and with IV contrast for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause. Although it can be performed independently, MRU can also be performed at the time of structural MRI. MRU without and with IV contrast is useful for investigating Hydronephrosis on Prior Imaging-Unknown Cause the etiology of hydronephrosis and, in combination with anatomical imaging, can provide a near-comprehensive evaluation of the genitourinary tract including both morphological and functional information. In a prospective study, Claudon et al [14] compared MRU without and with IV contrast with MAG3 or DTPA DRG in 295 adult and pediatric patients with hydronephrosis and clinical suspicion for chronic or intermittent obstruction, including both symptomatic and asymptomatic patients and excluding those with acute urinary obstruction or solitary or transplant kidney. They reported equivalence of MRU with renal scintigraphy for diagnostic evaluation of split renal function in moderately dilated kidneys, with a standard deviation of approximately 12% between the two; for severely dilated kidneys, they note a mean underestimation by MRU of split renal function by 4%. They conclude that substitution of DRG by MRU is acceptable for moderately dilated kidneys but remains questionable for severely dilated kidneys.
Hydronephrosis on Prior Imaging Unknown Cause. MRI Abdomen Without and With IV Contrast There is limited evidence to support the use of MRI abdomen without and with IV contrast (separate from MRU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause. MRI Abdomen Without IV Contrast There is limited evidence to support the use of MRI abdomen without IV contrast (separate from MRU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause. MRU Without and With IV Contrast There is some evidence for use of MRU without and with IV contrast for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause. Although it can be performed independently, MRU can also be performed at the time of structural MRI. MRU without and with IV contrast is useful for investigating Hydronephrosis on Prior Imaging-Unknown Cause the etiology of hydronephrosis and, in combination with anatomical imaging, can provide a near-comprehensive evaluation of the genitourinary tract including both morphological and functional information. In a prospective study, Claudon et al [14] compared MRU without and with IV contrast with MAG3 or DTPA DRG in 295 adult and pediatric patients with hydronephrosis and clinical suspicion for chronic or intermittent obstruction, including both symptomatic and asymptomatic patients and excluding those with acute urinary obstruction or solitary or transplant kidney. They reported equivalence of MRU with renal scintigraphy for diagnostic evaluation of split renal function in moderately dilated kidneys, with a standard deviation of approximately 12% between the two; for severely dilated kidneys, they note a mean underestimation by MRU of split renal function by 4%. They conclude that substitution of DRG by MRU is acceptable for moderately dilated kidneys but remains questionable for severely dilated kidneys.