title: Myopathy with fatiguability--myositis or myasthenia?
mesh_terms: D001706:Biopsy; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D009157:Myasthenia Gravis / Q000175:diagnosis*; D009220:Myositis / Q000175:diagnosis* / Q000473:pathology