Bladder cancer is of 3 types:
Urothelial carcinoma (transitional cell carcinoma): Cancers start in the urothelial cells which line the inside of the bladder. It accounts for about 90% of all bladder cancers.
Squamous cell carcinoma of urinary bladder is a malignant neoplasm which is derived from urothelium with squamous phenotype. Nearly 1% to 2% of bladder cancers are squamous cell carcinomas.
Adenocarcinoma: It is a very uncommon malignancy in the urinary bladder which arises primarily in the bladder as well as secondarily from other organs. It has been reported that 1% of bladder cancers are adenocarcinomas.