Metanephric adenoma-like tumors of the kidney: report of 3 malignancies with emphasis on discriminating features.

BACKGROUND Metanephric adenoma is a very rare benign renal tumor; only 80 well-documented cases have been reported to date. We have seen several renal tumors that were originally incorrectly diagnosed as metanephric adenoma. DESIGN We present 3 unusual renal tumors (2 primary and 1 metastatic), each of which illustrates important pathologic features… CONTINUE READING