{'fraction_non_alphanumeric': 0.043010752688172046, 'fraction_numerical': 0.021505376344086023, 'mean_word_length': 5.392156862745098, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 1, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Teaching Video NeuroImages: Rippling muscle disease with caveolin myopathy

A 43-year-old man described adolescence-onset abnormal muscle contractions. On examination, there was hypertrophy (figure) with normal power of thigh muscles but mild weakness of distal leg muscles (Medical Research Council grade 4+/5). Muscle percussion and stretching induced electrically silent slow rolling muscle contractions (video 1). He had mildly elevated creatine kinase (600 U/L). Family history was consistent with autosomal dominant rippling muscle disease.1 A heterozygous variant was documented in coding exons of the caveolin 3 gene (CAV c. 83A>T;p.Asp28Val).