Fig. 2
From: Low-grade oncocytic tumour of kidney (CD117-negative, cytokeratin 7-positive)
Low-grade oncocytic tumour of kidney. HE stain shows the transition between a solid oncocytic area with cords of tumor cells in edematous stromal (a, 40x; and b; 100x). HE stain also shows zones of fresh hemorrhage (c, 40x; and d, 100x). Stromal edematous areas show frequent hemosiderin-laden macrophages. Immunohistochemistry shows strong and diffuse expression of cytokeratin 7 (e, 40x) and absence of c-KIT expression (f, 100x). Again, hemosiderin-laden macrophages show brown pigment in edematous stroma