An 85-year-old male was admitted to our hospital with the chief complaint of a left hydronephrosis. Computed tomography (CT) revealed left hydronephrosis and a left ureteral tumor. We performed left nephroureterectomy. Microscopically, the neoplasm was composed of a mixture of transitional cell carcinoma and adenocarcinoma. To our knowledge, this case is the 14th report of mixed carcinoma of the upper urinary tract.
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