In 2000 a previously normal Virginia schoolteacher began having pedophiliac sexual urges, he tried seeking counseling help, but failed a Sexaholics Anonymous course.
The day before jail, he checked himself into the emergency room where they found a large brain tumor. The tumor was cut out and his urges went away, he easily passed the SA and became completely normal.
A year later the aberrant sexual urges returned, he went back to the hospital, and the doctors found a peice of the tumor was left behind/grew back. After a second surgery the man again lost all abnornal sexual urges and began to live a normal life.
Dr. Stuart C. Yudofsky, a psychiatrist at the Baylor College of Medicine who specializes in behavioral changes associated with brain disorders, also has seen the way brain tumors can bend a person’s behavior. “This tells us something about being human, doesn’t it?” Yudofsky said. If one’s actions are governed by how well the brain is working, “does it mean we have less free will than we think?” (1)