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FIGURE 3. Acute, total obstruction. Severe impairment of flow and function in right kidney, persistent cortical nephrogram, no visualization of drainage system even after enhancement (22E), and rising renogram are seen. Nonvisualization of right ureter even after enhancement (22E) is critical in differentiating total obstruction from stunned kidney (Fig. 4). E = intensity-enhanced image; FL = first-pass flow (3-s image).

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