Synchronous sporadic bilateral multiple chromophobe renal cell carcinoma accompanied by a clear cell carcinoma and a cyst: A case report

Figure 4 A 50-year-old male with a pathologically proven chromophobe renal cell carcinoma in the right kidney (eosinophilic type). A: Hematoxylin and eosin staining showing tubular or acinar structures, eosinophilic to pale cytoplasm with accentuated cell borders, and “raisinoid” nuclear membranes (100 ×); B: Immunohistochemical staining showing negative expression of carbonic anhydrase 9 (100 ×); C: Immunohistochemical staining showing cluster of differentiation 117 was moderately diffusely positive in the cytoplasm/membrane (100 ×); D: Immunohistochemical staining showing cytokeratin 7 (D) was strongly diffusely positive in the cytoplasm/membrane (100 ×).