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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.
Centronuclear and Myotubular Myopathies. To view the best illustration of muscle funtion that I've ever seen produced by Alan Beggs click here. Centronuclear (CNM) and X-linked Myotubular Myopathies (XLMTM) are rare genetic disorders (also known as orphan diseases). These particular genetic disorders affect skeletal muscle tissue. The severity of the disease differs from case to case, ranging from slightly debilitating to fatal.