Abstract
A case of perilymphatic fistula is reported. The patient was a 58-year-old male, who initially showed moderate conductive deafness in the right ear. However, soon after the furosemide test, his hearing loss worsened and became sensorineural. Electrocochleography revealed the dominant negative SP, and a signs of endlymphatic hydrops.
During exploratory surgery, a fistula was found in the posterior part of the round window membrane, and was closed, with improvement vertigo and hearing loss. As no middle ear disorder was found in otological and radiological examinations, the principal factor causing the conductive deafness was speculated to be an air bubble just beneath the footplate.
