<prompt> False about myositis ossificans progressiva child with heterotopic ossification is?Pneumonia is commonLife longevity is normalMost common site involved is the spineOnset is before 6 years  <response>: Myositis ossificans progressiva is a autosomal dominant disease is characterized by heterotopic ossification most commonly involving spine and congenital deformities of hand and feet. The disease usually stas before 6 years of age. In myositis ossificans progressiva, the life expectancy is decreased and the commonest cause of death is lung diseases. Ref: Harrison 17e, Page 2416. 