Although US allows evaluation for increased renal echogenicity, which is nonspecific, but can be helpful in assessing for chronic kidney disease, US abdomen is a less comprehensive examination of the genitourinary system than CT or MRU, renal scintigraphy, or US color Doppler kidneys and bladder retroperitoneal. US Color Doppler Kidneys and Bladder Retroperitoneal Although there is limited evidence to support the use of US of the abdomen for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause, it may be useful in this setting in some clinical situations. Although renal US can identify and grade hydronephrosis, it is less useful for identification of etiology. US does allow evaluation for increased renal echogenicity, which, although nonspecific, can be helpful in assessing for chronic kidney disease. Additionally, US color Doppler kidneys and bladder retroperitoneal allows evaluation of ureteral jets, bladder distension, and postvoid residual bladder volume and can allow measurement of the prostate to evaluate for prostatomegaly. Unilateral elevation of resistive indices is nonspecific but can be seen in the setting of obstruction. However, more comprehensive evaluation can often be achieved with CT, MRU, or renal scintigraphy. Variant 2: Adult. Asymptomatic bilateral hydronephrosis or asymptomatic hydronephrosis in a solitary kidney with unknown cause. Initial imaging. Please note that this variant describes initial imaging evaluation after the discovery, by imaging or otherwise, of asymptomatic bilateral hydronephrosis or asymptomatic hydronephrosis in a solitary kidney 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, US). Hydronephrosis on Prior Imaging-Unknown Cause
Hydronephrosis on Prior Imaging Unknown Cause. Although US allows evaluation for increased renal echogenicity, which is nonspecific, but can be helpful in assessing for chronic kidney disease, US abdomen is a less comprehensive examination of the genitourinary system than CT or MRU, renal scintigraphy, or US color Doppler kidneys and bladder retroperitoneal. US Color Doppler Kidneys and Bladder Retroperitoneal Although there is limited evidence to support the use of US of the abdomen for initial imaging of patients with asymptomatic unilateral hydronephrosis with unknown cause, it may be useful in this setting in some clinical situations. Although renal US can identify and grade hydronephrosis, it is less useful for identification of etiology. US does allow evaluation for increased renal echogenicity, which, although nonspecific, can be helpful in assessing for chronic kidney disease. Additionally, US color Doppler kidneys and bladder retroperitoneal allows evaluation of ureteral jets, bladder distension, and postvoid residual bladder volume and can allow measurement of the prostate to evaluate for prostatomegaly. Unilateral elevation of resistive indices is nonspecific but can be seen in the setting of obstruction. However, more comprehensive evaluation can often be achieved with CT, MRU, or renal scintigraphy. Variant 2: Adult. Asymptomatic bilateral hydronephrosis or asymptomatic hydronephrosis in a solitary kidney with unknown cause. Initial imaging. Please note that this variant describes initial imaging evaluation after the discovery, by imaging or otherwise, of asymptomatic bilateral hydronephrosis or asymptomatic hydronephrosis in a solitary kidney 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, US). Hydronephrosis on Prior Imaging-Unknown Cause