What Drives People to Want to Be Amputees?

Karl is a double amputee, but not by accident, birth or disease. He is an amputee by choice.

Six years ago, Karl (who asked that his real name not be used) sat alone in a parked car with 100 pounds of dry ice and an obsession to destroy his legs.

Karl is not a one-of-a-kind medical mystery, however. There are others like him, who believe their bodies don't match the picture of themselves they have in their minds.