| Phenotype details |
neonatal truncal hypotonia, slowly improved during childhood; 18m-long myopathic face, open triangular mouth, high-arched palate, narrow chest mainly diaphragmatic breathing, marked generalised hypotonia, absent deep tendon reflexes, exaggerated lumbar lordosis on standing; childhood-stable generalised weakness, difficulty running could not jump, weakness prominent in proximal lower limb muscles, ankle dorsiflexors, neck movements, mild scoliosis; 17y-echocardiogram normal cardiac function, borderline aortic dilatation at the aortic sinuses; 20y-pulmonary vital capacity 37%; sleep study severe hypoventilation, non-invasive nocturnal ventilation was commenced; crawl-10m, walk-15m |