Serial pure tone audiograms in Cogan's syndrome

Three audiograms are presented from a patient with Cogan's syndrome and hearing loss: A) Two months after the onset of Cogan's syndrome during initial corticosteroid therapy; B) Four and one-half years into disease course while taking alternate-day corticosteroid therapy; C) Eight years after onset of disease with stable to improved hearing acuity. _-----_, right ear; X-----X, left ear.