MRI abdomen and pelvis without and with IV contrast is defined as any protocol not specifically tailored for evaluation of the upper and lower urinary tracts, without both the precontrast and excretory phases, and without heavily T2-weighted images of the urinary tract. OR Discussion of Procedures by Variant Variant 1: Adult. Asymptomatic unilateral hydronephrosis with unknown cause. Initial imaging. Please note that this variant describes initial imaging evaluation after the discovery, by imaging or otherwise, of asymptomatic unilateral hydronephrosis with unknown cause. The choice of initial imaging in this situation is dependent on clinical context and on the information available from the means of hydronephrosis discovery (eg, CT, MR, ultrasound [US]). CT Abdomen and Pelvis With IV Contrast Although there is limited evidence to support the use of CT abdomen and pelvis with IV contrast (separate from CTU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause, it may be useful in this setting in some clinical situations. A more comprehensive evaluation can often be achieved with CT, MRU, or renal scintigraphy. CT Abdomen and Pelvis Without and With IV Contrast There is limited evidence to support the use of CT abdomen and pelvis without and with IV contrast (separate from CTU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause, and more comprehensive evaluation with CT, MRU, or renal scintigraphy is preferred. CT Abdomen and Pelvis Without IV Contrast Although there is limited evidence to support the use of CT abdomen and pelvis without IV contrast (separate from CTU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause, it may be useful in this setting for some clinical situations. A more comprehensive evaluation can often be achieved with CT, MRU, or renal scintigraphy.
Hydronephrosis on Prior Imaging Unknown Cause. MRI abdomen and pelvis without and with IV contrast is defined as any protocol not specifically tailored for evaluation of the upper and lower urinary tracts, without both the precontrast and excretory phases, and without heavily T2-weighted images of the urinary tract. OR Discussion of Procedures by Variant Variant 1: Adult. Asymptomatic unilateral hydronephrosis with unknown cause. Initial imaging. Please note that this variant describes initial imaging evaluation after the discovery, by imaging or otherwise, of asymptomatic unilateral hydronephrosis with unknown cause. The choice of initial imaging in this situation is dependent on clinical context and on the information available from the means of hydronephrosis discovery (eg, CT, MR, ultrasound [US]). CT Abdomen and Pelvis With IV Contrast Although there is limited evidence to support the use of CT abdomen and pelvis with IV contrast (separate from CTU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause, it may be useful in this setting in some clinical situations. A more comprehensive evaluation can often be achieved with CT, MRU, or renal scintigraphy. CT Abdomen and Pelvis Without and With IV Contrast There is limited evidence to support the use of CT abdomen and pelvis without and with IV contrast (separate from CTU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause, and more comprehensive evaluation with CT, MRU, or renal scintigraphy is preferred. CT Abdomen and Pelvis Without IV Contrast Although there is limited evidence to support the use of CT abdomen and pelvis without IV contrast (separate from CTU) for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause, it may be useful in this setting for some clinical situations. A more comprehensive evaluation can often be achieved with CT, MRU, or renal scintigraphy.