| MYO | a severe form of muscular dystrophy marked by facial weakness and drooping eyelids and difficult speech and difficulty with the hands that spreads to the arms and shoulders and legs and hips |
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| MYO | a mild, rare, congenital form of myotonia characterized by muscle stiffness |
| MYO | of or relating to or caused by myotonia |
| MYO | a severe form of muscular dystrophy marked by facial weakness and drooping eyelids and difficult speech and difficulty with the hands that spreads to the arms and shoulders and legs and hips |