The CyberKnife® Robotic Radiosurgery System was cleared by the U.S. Food and Drug Administration in 2001 to treat tumors anywhere in the body, including the liver. Despite its name, the CyberKnife System is not a surgical procedure. In fact, there is no cutting involved. Instead, the CyberKnife System delivers high doses of radiation directly to liver tumors. The CyberKnife System offers patients who cannot undergo liver cancer surgery due to their poor medical condition, or who refuse surgery, a minimally invasive alternative treatment for liver cancer. CyberKnife liver cancer treatments are typically performed on an outpatient basis in one to five days, requiring no overnight hospital stays. Most patients experience minimal to no side effects with a quick recovery time.