A carcinosarcoma implies a mixed neoplasm containing epithelial and mesenchymal
elements, each of which displays a different morphological criterion of malignancy.
These neoplasms are relatively rare and mainly encountered in various organs, such as
uterus, breast, esophagus, larynx, lung, urinary bladder, prostate and salpinx.
In kidney, malignant neoplasm comprised of epithelial and sarcomatous components are
usually,designated as Wilms' tumor or nephroblastoma and commonly occur in children.
Although most of authors have thought that carcinosarcoma is an adult Wilms' tumor,
there well documented cases of carcinosarcoma in adult kidney
We reported a case of carcinosarcoma arising in 42-year-old male kidney, who had
underwent three times of operation because of recurrent transitsonal cell carcinoma of
urinary bladder.
Histologically the neoplasm was composed of epithelial components of transitional and
squamous cell carcinoma, and mesenchymal components of fibrosarcoma, myxosarcoma,
myosarcoma, and undifferentiated sarcoma.
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