[Comparative analysis of the histological variants of renal cell cancer]

85 cases of renal-cell carcinoma are studied histologically, cytologically and electron-microscopically. Morphological variant was determined according to the classification of N. A. Krayevsky et al. Histological and cytological variants of renal-cell carcinoma, differences of the degree of their differentiation are shown. Electron-microscopically the cell types characteristic of clear-cell and granular-cell variants of a different degree of differentiation are distinguished. Similarity of cell ultrastructure in granular-cell, sarcoma-like and glandular tumour variants is found. The ultrastructural features of nephrocytes and renal tubules in the form of the accumulation of microvilli, cytoplasmic membrane invaginations, desmosomes, basal membrane fragments which are seen as the markers of the tumour organospecificity were preserved in all variants of renal-cell carcinoma studied.