This happened to a colleague who had a client that was paraplegic. She had asked doctors to remove her leg as it was getting in her way and was just 'dead weight', she has no feeling or control over the leg. Doctors said she was out of her mind and refused to remove it. But she understood the risks around removing and made a concious rational decision to remove the leg herself. She failed of course, she got part way through the bone before phoning an ambulance. The doctors had to amputate then.
Of course medical professionals and psychologists wanted my colleague to section the lady under the mental health act. Thing is she really wasnt 'mad'. Like this gentleman proves sometimes you have to take things into your own hands