[Hypernephroma cells in pleural effusions]

A rare case of finding of hypernephroma cells in pleural effusion as well as their cytomorphological picture are presented in this paper. Cytomorphologically, the hypernephroma cells in pleural effusion occurred in clusters from three, four to about twenty of cells and rarely appeared singly. The cytoplasm of the cells appeared to be abundant, not sharply bordered and varied in colour from a light-grey to a slight pink-grey while within the cytoplasm, the small pale vacuoles were visible. The nuclei of the cells were regularly round-to-oval shape with a slight anisonucleosis and contained one, rarely two, a good visible blue nucleoli. Of other cells, erythrocytes were also present together with the cells of mesothelial serosa and lymphocytes. Cytomorphologically, the hypernephroma cells in pleural effusion have the same characteristics as have the hypernephroma cells in metastases of lymph nodes in mediastinum or in metastatic nodes of the lung.