Click on image to view larger version.
FIGURE 2. (A) Partial obstruction, proximal (ureteropelvic junction), moderate. Hydronephrosis (2 min), late filling, and then retention (stasis) are seen within pelvis of right kidney (6–22). Ureter is seen intermittently without stasis. Cortical retention is mild. Left kidney is small and hypofunctioning (atrophic) but drains normally despite some activity that is more prominent than usual activity in pelvis. Because of size discrepancy, abnormalities in relative flow and function of kidneys cannot easily be seen. (B) Partial obstruction, distal (ureterovesical junction), severe. Decreased flow and function of right kidney and cortical retention of activity are evident. Delayed (20 min) and persistent high-intensity activity (stasis) is seen in pelvis and ureter. E = intensity-enhanced image; FL = first-pass flow (3-s image).
