PMC9807339_01
(a) Plain CT showing a 31-mm mass in the upper part of the left kidney. (b)-(e) Four-phase contrast-enhanced CT. (b) Arterial phase. (c) Corticomedullary phase. (d) Nephrographic phase. (e) Excretory phase. Early enhanced lesions were not seen.
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Contrast-enhanced dynamic CT showed a 31-mm mass without early enhanced lesions in the upper part of the left kidney (Fig. 1).