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Osteoclast-rich undifferentiated carcinoma of the urinary tract is a rare tumor which histologically mimicks giant cell tumor of bone. The histogenesis of this tumor has not been clarified yet although its urothelial origin is proposed on the basis of positive reactions of an epithelial marker on mononuclear undifferentiated tumor cells and the existence of foci of a urothelial carcinoma component...
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