Fig. 2From: Papillary renal neoplasm with reverse polarity may be a novel renal cell tumor entity with low malignant potentialSome unusual morphological features of papillary renal neoplasm with reverse polarity. A Patchy necrosis in tumor tissue. B Hemosiderin deposits in the cytoplasm of tumor cells, especially in the edge of tumors. C Tumor components focally invaded into renal parenchyma. D One tumor exhibited perineural invasionBack to article page