CHARLOTTESVILLE, Va. - There was something wrong with the schoolteacher with the headache — doctors could see that from the start. Though charming and intelligent, the 40-year-old man couldn't stop leering at female nurses. He had been in trouble with the law for sexual advances toward his stepdaughter, and now he was talking about raping his landlady. University of Virginia Medical Center neurologists Dr. Russell Swerdlow and Dr. Jeffrey Burns had never seen a case like this. The man had an egg-sized brain tumor pressing on the right frontal lobe. When surgeons removed it, the lewd behavior and pedophilia faded...