Myositis Ossificans Progressiva

myositis ossificans progressiva,

a progressive disease beginning in early life, in which the muscles are gradually converted into bony tissue. Also called fibrodysplasia ossificans progressiva, progressive ossifying myositis.

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Stone Man Disease

A rare idiopathic or autosomal dominant MIM 135100 condition of irregular penetration and pre-pubertal onset, in which connective/interstitial tissues undergo extensive fibrosis and heterotopic ossification of ligaments, tendons, muscle, fascia, aponeuroses and skin, first seen in late childhood as firm masses. The abnormal development of bone may lead to stiffness in affected areas and may also limit movement in affected joints, e.g., knees, wrists, shoulders, spine, and/or neck
DiffDx Osseous metaplasia, myositis ossificans, extraskeletal osteosarcoma