Introduction Fibrodysplasia ossificans progressiva (FOP) is a rare, progressively debilitating disorder first described in 1692 by Guy Patin [1]. This disease is characterized by progressive heterotopic ossification that forms normal bone in characteristic extraskeletal sites and congenital malformations of the great toes. Progressive episodes of heterotopic ossification occur in characteristic pattern first at the dorsal, axial, […]
