apotemnophilia

noun

ap·​o·​tem·​no·​phil·​ia ˌa-pə-ˌtem-nō-ˈfi-lē-ə, -ˈfē- 

: an overwhelming or obsessive desire to have one or more healthy body parts and especially a limb removed by amputation

… the characteristic findings of this fascinating disease clearly distinguish apotemnophilia as a unique paraphilia.

—J. Bensler et al., The Southern Medical Journal

Some physicians … have publicly asserted the need for formal investigation of the possible neurological underpinnings of apotemnophilia.

—Annemarie Bridy, The Journal of Law, Medicine & Ethics