again, and the patient was discharged without treatment. A week later there was no paresthesia, motor weakness nor sensory deficit. Other An engineer replaced a woodpecker-damaged feed horn of a high-power microwave antenna, a 15-meter dish at an Earth station of a television network, using a cherry picker. After finishing, he sent his technician to power up the transmitter, and attempted to lower the cherry picker down. The engine failed and the engineer was stuck next to the antenna, outside of its main lobe but well within the first sidelobe. The technician, unaware that the engineer was still close to the antenna, powered it up. The engineer was exposed to an intense microwave field for about three minutes, until the error was realized. There were no immediate symptoms; the next morning the engineer detected blood and solid matter in his urine, and visited a doctor, who found blood in stool and massive bowel adhesions. The engineer's medical problems lasted for many years. Medical uses Dielectric heating (diathermy) is used in medicine; the frequencies used typically lie in the ultrasonic, shortwave, and microwave ranges. Careless application, especially when the patient has implanted metal conductors (e.g. cardiostimulator leads), can cause burns of skin and deeper tissues and even death. Microwave damage to tissues can be intentionally exploited as a therapeutic technique, e.g. radiofrequency ablation and radiofrequency lesioning. Controlled destruction of tissue is performed for treatment of arrhythmia. Microwave coagulation can be used for some kinds of surgeries, e.g., stopping bleeding after a severe liver injury. Microwave heating seems to cause more damage to bacteria than equivalent thermal-only heating. However food reheated in a microwave oven typically reaches lower temperature than classically reheated, therefore pathogens are more likely to survive. Microwave heating of blood, e.g. for transfusion, is contraindicated, as it can cause hemolysis and hyperkalemia. Microwave heating is one of the methods for inducing hyperthermia for hyperthermia therapy. High-energy microwaves are used in neurobiology experiments to kill small laboratory animals (mice, rats) in order to fix brain metabolites without the loss of anatomical integrity of the tissue. The instruments used are designed to focus most of the power to the animal's head. The unconsciousness and death is nearly instant, occurring in less than one second, and the method is the most efficient one to fix brain tissue chemical activity. A 2.45 GHz, 6.5 kW source will heat the brain of a 30