Focal therapy for prostate cancer is a minimally invasive procedure that uses controlled energy to destroy cancerous tissue within the prostate gland. Two of the commonest forms of energy sources used include High-Intensity Focused Ultrasound (HIFU) and cryotherapy.
In HIFU, heat is generated by an ultrasound probe that is inserted into the rectum and directed towards the region with prostate cancer, resulting in death of the cancer cells. For cryotherapy, thin needles (cryoprobes) are inserted through the perineum (the area between the scrotum and rectum) directly into the prostate under ultrasound guidance. These probes deliver argon gas to create ice balls that freeze and destroy targeted cancer cells. The body naturally absorbs the dead tissue over time.