Achondroplasia is a form of dwarfism that is characterized by short members and normal-sized abdomen, torso, neck, and head.
Could there be a form of gigantism that is characterized by long members and normal-sized abdomen, torso, neck, and head?
I ask because I am writing a story with a character having "inverted achondroplasia". If this hypothetical syndrome exists, is it dominant, recessive, autosomal, x-linked, y-linked, or mitochondrial?