[Comparative characteristics of the stroma of renal adenomas and cancer]

In a comparative study of 120 renal carcinomas and 10 adenomas it was found that in the adenomas the stroma as well as vessels were uniform with respect to distribution and degree of maturity and showed only scanty lymphoid infiltration, but that in the carcinomas, on the contrary, the distribution was irregular and lymphoid infiltration was much more abundant, particularly in areas of invasive growth. A close correlation was observed between stromal morphology and proliferative activity of the tumor. It is concluded that morphologic differences between these two kinds of tumor may be of use in diagnostic differentiation.