A CASE OF WILMS TUMOR OF ADULTHOOD METASTASIZED TO THE BREAST

Abstract

A case of Wilms tumor of adulthood metastasiued to the breast is reported. Wilms tumor is principally a malignant tumor arising in the childhood kidney and it rarely occurs in adults. There have been only 103 adult cases in Japan. And, in general, the most probable neoplasm metastasizing to the breast is malignant lymphoma, follwed by leukemia and gastric cancer, in this order, and no breast metastasis of renal tumor has been reported as yet. A 44-year-old woman was seen at the hospital because of a left breast tumor. A diagnosis of double cancer of the left breast and right kidney was made, and a left mastectomy with associated resection of the pectoral muscle on July 9 and total resections of the right kidney and ureter on August 21, 1996 were performed. Histopathologically, the right renal tumor was Wilms tumor and the left breast tumor was thought to be metastatic foci rather than primary breast tumor because no obvious epithelial components were seen. The definite diagnosis of Wilms tumor of adulthood and breast metastasis was established. Wilms tumors of adulthood can be classified into favorable histology (FH) and unfavorable histology (UH) by histologic types. This patients is classified into UH who may have a poor prognosis and would demand further strict observation of clinical course.