Proximal spinal muscular atrophy.
D000293:Adolescent; D000328:Adult; D001706:Biopsy; D003937:Diagnosis, Differential; D004576:Electromyography; D006801:Humans; D008297:Male; D009046:Motor Neurons / Q000473:pathology*; D009103:Multiple Sclerosis / Q000175:diagnosis; D009133:Muscular Atrophy / Q000175:diagnosis* / Q000473:pathology*; D009136:Muscular Dystrophies / Q000175:diagnosis; D013118:Spinal Cord Diseases / Q000175:diagnosis* / Q000473:pathology*