A malignant tumor that arises from the transitional (urothelial) epithelial cells lining the urinary tract from the renal calyces to the ureteral orifice. The phenotype is Human Phenotype Ontology term HP_0030409 (Renal transitional cell carcinoma). Also known as: Renal urothelial carcinoma, Transitional renal cell carcinoma, renal TCC.