| Phenotype details |
see paper; ..., 2y-onset heterotopic ossification; progressive heterotopic ossification in characteristic anatomic patterns; conductive hearing impairment; cervical spine malformations (intra-articular ankylosis facet joints, early degenerative changes cervical spine); proximal medial tibial osteochondromas; short broad femoral necks; thumb malformations (short 1st metacarpal, +/- monophalangism); severe variable reduction deficits of digits; absent finger/toe nails in digits with severe reduction deficits; sparse, thin scalp hair (more prominent in 2nd decade); mild cognitive impairment; anatomic abnormalities of cerebellum; |