A late form of distal myopathy (Miyoshi-like distal myopathy, MMD3) in this patient was evidenced by hypertrophy of the left ventricle, with a decreased contractile ability, fibrillation of atria and weakness of the distal skeletal muscles in combination with increased plasma CPK activity, as well as the results of the skeletal muscle biopsy. The gene discussed is PIK3C2A; the disease is distal myopathy.