Is compulsion to amputate healthy limbs mind or matter?

One day, after years of agony, an Australian man took a large quantity of dry ice and intentionally damaged his left leg, so that a surgeon would have to amputate it.The action was intentional and the man, Robert Vickers, described the feeling of waking up in the hospital without his leg as “absolute ecstasy.” He’s one of a small number of people who have what psychiatrists have come to call body integrity identity disorder in which patients report the desire to have one or more of their limbs amputated because the extremities don’t feel like they “belong” to their bodies.
Full story by Alexis Madrigal @ 'Wired' via 'Renegade Futurist'