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Welcome. Myotubular Myopathy is a rare muscle condition which affects mostly boys at birth, and sometimes an even rarer form develops later in life affecting both boys and girls. It causes profound muscle weakness.
With that in mind, myopathies are a group of diseases that cause muscle weakness, cramps, and spasms due to a primary defect of the muscle fiber. The more technical term for a muscle fiber is a myocyte, or muscle cell, or myofiber.o, myopathies are a group of diseases that cause muscle weakness, cramps, and spasms due to a primary defect of the muscle fiber. The more technical term for a muscle fiber is a myocyte. Some of the myopathies a person may have are genetic in their origin.