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Urothelium (or uroepithelium) is an example of transitional epithelium. It is the type of epithelium that lines much of the urinary tract including the renal pelvis, the ureters, the bladder, and parts of the urethra.
Tumors of the renal calyces, renal pelvis and ureters start in the layer of tissue that lines the bladder and the upper urinary tract, called the urothelium. Cancer that starts in the urothelium is called urothelial (or transitional cell) cancer. This is the most common type of cancer found in the bladder, as well. Because many of the organs in the urinary system share common cells, cancers found in these organs often look and act alike. Image Â© 2003 Fairman Studios, LLC.