👉 In medicine, a desmo-dium is a type of tumor or cancer that occurs in the lining of the urinary system. It is also known as ureteric urothelial carcinoma (UUC). UURCA is a rare form of cancer that can cause pain and other symptoms in the lower part of the urinary tract, including the bladder and urethra. The exact cause of this type of cancer remains unknown, but it has been linked to certain types of bacteria and viruses.