Collecting duct carcinoma (CDC) is a rare and aggressive type of kidney cancer. It is a type of renal cell carcinoma, which is the most common type of kidney cancer. CDC is a malignant tumor that develops in the collecting ducts of the kidney, which are the small tubes that carry urine from the kidney to the bladder. Symptoms of CDC include blood in the urine, pain in the side or lower back, and a lump in the abdomen. Treatment for CDC typically involves surgery to remove the tumor, followed by chemotherapy and/or radiation therapy.