fibrodysplasia ossificans progressiva; FOP
Medical term for a rare genetic disorder where soft tissues progressively turn into bone.
Fibrodysplasia ossificans progressiva is an intractable disease in which muscles and tendons turn into bone.
The term is a direct translation of the English medical name, composed of kanji meaning progressive (進行性), ossifying (骨化性), fibrous (線維), and dysplasia (異形成症).