Abstract
We report a case of a morphologically unusual renal cell carcinoma with features of both chromophobe and papillary carcinoma. Immunohistochemical analysis of high molecular weight cytokeratins (HMWCK), cytokeratin 7 (CK7), cytokeratin 19 (CK19), c-Kit, and α-methylacyl-CoA racemase (AMACR) demonstrated differential profiles for the two components of the tumor, consistent with the respective patterns commonly observed for pure chromophobe and papillary renal cell carcinomas. Specifically, the chromophobe tumor cells expressed CK7 and c-Kit weakly, while HMWCK, CK19, and AMACR were not detectable. In contrast, the papillary tumor cells expressed uniformly HMWCK, CK7, and c-Kit and focally CK19 and AMACR. Fluorescence in situ hybridization analysis of nuclei isolated from paraffin-embedded tumor tissue detected monosomy 1, disomy 7, and monosomy 17, a common and characteristic finding in chromophobe carcinomas, in a majority of, but not all tumor cells, whereas a population characterized by disomy 1, trisomy 7, and trisomy 17, a frequent finding in papillary carcinoma, was not identifiable. Electron microscopic analysis revealed numerous characteristic small cytoplasmic vesicles in the chromophobe areas, which were absent in the papillary component. This case illustrates the rare coexistence of two distinct and admixed histologic types of renal cell carcinoma.
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Roehrl, M.H.A., Selig, M.K., Nielsen, G.P. et al. A renal cell carcinoma with components of both chromophobe and papillary carcinoma. Virchows Arch 450, 93–101 (2007). https://doi.org/10.1007/s00428-006-0331-1
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DOI: https://doi.org/10.1007/s00428-006-0331-1