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Figure 1: Imaging findings before surgery. (a) Three-dimensional reconstruction of CTA revealed a hypovascular mass in the upper pole of left kidney. (b, c) CT findings revealed no significant enhancements and no clear border between the mass and renal pelvis, renal sinus and lower pole of normal renal arenchyma. (d) Left renal calices, pelvis and ureter didn't develop in intravenous pyelography and the other one was normal

Figure 1: Imaging findings before surgery. (a) Three-dimensional reconstruction of CTA revealed a hypovascular mass in the upper pole of left kidney. (b, c) CT findings revealed no significant enhancements
and no clear border between the mass and renal pelvis, renal sinus and lower pole of normal renal  arenchyma. (d) Left renal calices, pelvis and ureter didn't develop in intravenous pyelography and the other one was normal