Typical central core disease is a relatively mild congenital myopathy, usually characterized by motor developmental delay and signs of mild proximal weakness most pronounced in the hip girdle musculature. Orthopedic complications, particularly congenital dislocation of the hips and scoliosis, are common, and CCD patients are at risk of having malignant hyperthermia. Onset of CCD is usually in childhood, although adult onset has also been reported, illustrating phenotypic variability . Some patients can present in utero or at birth with severe congenital myopathy. [From OMIM]