case_images: PMC4300580_01
case_images: Left nephrostogram showing persistent focal narrowing in the proximal ureter (black arrow) with proximal hydroureteronephrosis. Central pooling of contrast is seen in interpole medulla (white arrow) giving the egg-in-a cup appearance
case_images: IJU-31-77-g001.jpg
case_images: PMC4300580_01_IJU-31-77-g001.jpg
case_images: F1
case_images: The nephrostogram obtained subsequently showed central pooling of contrast in the excavated area [Figure 1, white arrow] in the region of interpole papilla giving "egg-in-a-cup" appearance characteristic of papillary necrosis [Figure 1].