, approximately 800 cases of<unk>  have been confirmed worldwide making<unk>  one of the rarest diseases known. The estimated incidence of<unk>  is 0.5 cases per million people and affects all ethnicities.
Fibrodysplasia ossificans progressiva
Fibrous dysplasia of bone
Myositis ossificans
Langer–Giedion syndrome
Gerodermia osteodysplastica
Osteitis fibrosa cystica
Enchondromatosis
Osteoma cutis