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Fig. 1E. —37-year-old man with decreasing renal function who was referred for sonography to exclude hydronephrosis. After immunosuppression was decreased in patient, mass became markedly smaller and renal function improved. Coronal T1-weighted spin-echo MR image (TR/TE, 500/25) shows intimate relationship of mass (arrow) to renal allograft and resultant hydronephrosis. Note isointensity of T1 signal of in relation to with renal allograft parenchyma.