Outbreaks may be measurable clinically by elevated levels of alkaline phosphatase and bone-specific alkaline phosphatase. Another telltale sign of<unk>  is a shortened great toe with a malformed distal first metatarsal and a missing or abnormal first phalanx and/or interphalangeal joint.
Fibrodysplasia ossificans progressiva
Fibrous dysplasia of bone
Myositis ossificans
Langer–Giedion syndrome
Gerodermia osteodysplastica
Osteitis fibrosa cystica
Enchondromatosis
Osteoma cutis