Cystic low-grade collecting duct renal carcinoma with liver compression — A challenging diagnosis and therapy: A case report

Figure 5 Immunohistochemical profile of the collecting duct carcinoma. A: Tumor papillae containing CD68-positive foamy macrophages (magnification 20 ×); B: Proliferation index Ki67 < 5% (magnification 20 ×); C: CD10 – no expression on the tumor cells, with positive internal control on the left (magnification 4 ×); D: CK AE1/AE3 – diffuse positivity (magnification 20 ×); E: CD15 – diffuse positivity (magnification 10 ×); F: AMACR – diffuse positivity (magnification 10 ×); G: Vimentin – diffuse positivity (magnification 10 ×); H: CK19 – focal expression (magnification 20 ×); I: CK7 – focal expression (magnification 20 ×).