PMC4300580_01
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
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F1
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].