APA Dictionary of Psychology

a rare disorder characterized by a person’s belief that their body is marred by the presence of a particular (although healthy) body part, usually an arm or leg. The condition is associated with marked distress, leading the individual with BIID to wish that the limb was paralyzed, to seek elective surgery to have it removed, to attempt to remove the limb themself, or to injure the limb so badly that doctors are forced to amputate it. Also called amputee identity disorder; apotemnophilia.