抄録
Using high-resolution computed tomography (CT), we measured the area of mastoid air cells and the shortest length between the posterior wall of the external auditory canal and the anterior edge of the sigmoid sinus, and then compared the right-left difference in sixty cases of unilateral chronic otitis media and in twenty normal cases. In the case of unilateral chronic otitis media the shortest length between the external auditory canal and the sigmoid sinus was significantly short where there was poor mastoid pneumatization, regardless of whether it was the right or left ear. Mastoid pneumatization was found to be prohibited by chronic inflammantion, and as a result, the relative positions of the external auditory canal and the sigmoid sinus were affected.
