C9orf72 and oculopharyngeal muscular dystrophy: Common neuromuscular repeat expansion disorders not detectable via NGS include myotonic dystrophy 1 and 2, facioscapulohumeral muscular dystrophy 1 (FSHD1), oculopharyngeal muscular dystrophy (OPMD), oculopharyngodistal myopathies (52), and C9orf72-related amyotrophic lateral sclerosis.