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The cause of MSA has not been identified. MSA occurs in the general population in a sporadic manner. The disorder is degenerative and progressively worsens.
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atrophy is a decrease in muscle mass. Hypertrophy is muscle growth.
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Spinal muscular atrophy is an autosomal recessive disease. The severity of spinal muscular atrophy varies, and is the most common genetic cause of infant death.