Fig. 4: Immunohistochemical profiles of papillary renal neoplasm with reverse polarity.

The tumor cells were positive for cytokeratin 7 (a) and alpha-methylacyl-CoA racemase (b) and negative for CD10 (inset: matched normal renal tubules) (c). The Ki-67 immunostaining of papillary renal neoplasm with reverse polarity. Only a few cells are reactive for Ki-67. (d).