| Myopathies Presenting at Birth |
| Central core disease |
| Centronuclear (myotubular) myopathy |
| Congenital fiber-type disproportion |
| Congenital muscular dystrophy |
| Congenital myotonic dystrophy |
| Glycogen storage diseases (acid maltase and phosphorylase deficiencies) |
| Lipid storage diseases (carnitine deficiency) |
| Nemaline (rod) myopathy |
| Myopathies Presenting in Childhood |
| Congenital myopathies – Nemaline myopathy, Centronuclear myopathy, Central Core |
| Endocrine-metabolic disorders – hypokalemia, hypocalcemia, hypercalcemia |
| Glycogen storage disease (acid maltase deficiency) |
| Inflammatory myopathies – dermatomyositis, polymyositis (rarely) |
| Lipid storage disease (carnitine deficiency) |
| Mitochondrial myopathies |
| Muscular dystrophies – Congenital, Duchenne, Becker, Emery-Dreifuss, Facioscapulohumeral, Limb-girdle |
| Myopathies Presenting in Adulthood |
| Centronuclar myopathy |
| Distal myopathies |
| Endocrine myopathies – thyroid, parathyroid, adrenal, pituitary disorders |
| Inflammatory myopathies - polymyositis, dermatomyositis, inclusion body myositis, viral (HIV) |
| Metabolic myopathies – acid maltase deficiency, lipid storage diseases, debrancher deficiency, phosphorylase b kinase deficiency |
| Mitochondrial myopathies |
| Muscular dystrophies – Limb-girdle, Facioscapulohumeral, Becker, Emery-Dreifuss |
| Myotonic dystrophy |
| Nemaline myopathy |
| Toxic myopathies – alcohol, corticosteroids, local injections of narcotics, colchicine, chloroquine |
