Tumor-to-tumor metastasis of clear cell renal cell carcinoma to contralateral synchronous pheochromocytoma: A case report

Figure 3 Histopathological and immunohistochemiscal figures showed the left retroperitoneal tumor mass contained two components. A: One component was typical pheochromocytoma (PCC) with tumor cells arranged in organoid nests and cords; B: The other component exhibited clear cell renal cell carcinoma (CCRCC) morphology; C: The PCC nests at high magnification; D: The PCC nests mixed with CCRCC at their intersection; E: Immunohistochemistry (IHC) showed PAX8 was positive in the CCRCC tumor cells; F: IHC showed CAIX was positive in the CCRCC tumor cells; G: PCC tumor cells showed positive for CgA; H: PCC tumor cells showed positive for Syn.