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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.
By Dr Tomislav MeÅ¡troviÄ, MD, PhD. Myopathies are a group of disorders characterized by a primary structural or functional impairment of skeletal muscle.They usually affect muscle without involving the nervous system, resulting in muscular weakness.yopathies can manifest with either ânegativeâ or âpositiveâ symptoms. Negative symptoms include muscle weakness, exercise intolerance and fatigue, while so called positive symptoms usually encompass cramps and myalgias, with occasional contractures, myotonia and myoglobinuria.