Urothelial carcinoma is a type of cancer that originates in the urothelium, the tissue lining the bladder and other parts of the urinary tract. It is the most common form of bladder cancer and can also occur in the ureters and renal pelvis. This cancer can be classified into different stages, depending on how deeply it invades the bladder wall. Symptoms of urothelial carcinoma may include blood in the urine, frequent urination, and pain during urination. Diagnosis typically involves imaging tests, cystoscopy, and biopsy. Treatment options may include surgery, chemotherapy, and immunotherapy, depending on the stage and severity of the disease.