It must be particularly difficult to relate to those of us that don't have that disorder. When the patient in the article described his leg as foreign, or that his "soul doesn't extend into that part" of his leg, my first thought was that surely amputees would feel similarly about their prosthetics, but by all reports a good prosthetic has a positive effect on those amputees.

Maybe they feel more like the limb is a parasite? If I imagine that I had a large parasite permanently attached to my body, I could begin to understand the desperation to have it removed.