Temporal bone findings in Cogan's syndrome.

We report on the pathological findings in temporal bones taken from a 92-year-old man who had been diagnosed as suffering from Cogan's syndrome before death. Extensive endolymphatic hydrops was observed in the cochlea of the right ear. The saccule showed a collapse following intense dilation. Outpouching of the utricle and crus commune was found and the perilymphatic space of the posterior semicircular canal was occupied by the fibrotic tissue. The left ear showed neither hydrops nor fibrosis. There was absorption of the enchondral bone in both ears, but in the blood vessels there were no pathological changes.