PMC9885144_01
Preoperative renal enhanced computed tomography. Arrows show the tumors in the upper poles of bilateral native kidneys. (A) the tumors are enhanced in the cortical phase; (B) The enhancement of tumors is markedly reduced in the medullary phase, showing the performance of "fast in and fast out".
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Surprisingly, the CT revealed that the patient also had a nodule in the upper pole of the right native kidney and mild enhancement was seen in the nodule in the cortical phase ( Figure 1 ).
Postoperative pathology (HEx200): (A) The tumor in the left native kidney is clear cell renal cell carcinoma. The cancer cells are transparent and arranged in empty nests, and thin-walled sinusoidal vessels form a reticular septum; (B) The tumor in the left native kidney is type I papillary renal cell carcinoma of the right native kidney. Papillary structures formed by fibrovascular axis with foamy macrophages.
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Pathological diagnosis ( Figure 2 ): (left native kidney) clear cell RCC, WHO grade 1, T1bN0M0; (right native kidney) type 1 papillary RCC with papillary adenoma formation, Fuhrman grade 1, T1aN0M0.