Dystrophia myotonica probably caused by chloroquine.
D001706:Biopsy; D002738:Chloroquine / Q000009:adverse effects*; D003907:Dexamethasone / Q000009:adverse effects; D004576:Electromyography; D005260:Female; D006801:Humans; D007592:Joint Diseases / Q000188:drug therapy; D008875:Middle Aged; D009223:Myotonic Dystrophy / Q000209:etiology*