Local anesthetics cause loss of feeling in a part of the body.
General anesthetics put the person to sleep. Filling the bladder with a solution of BCG is a form of biological therapy for superficial bladder cancer. Also used to lessen side effects that may be caused by some cancer treatments. The removal of cells or tissues for examination under a microscope. When only a sample of tissue is removed, the procedure is called an incisional biopsy or core biopsy.