We investigated two cases of adhesive otitis media in temporal bones. Dr Ishii has previously classified adhesive otitis media into four types. In the two cases in question (classified as Type I and II), we observed the following common pathological findings: (Type I: Adhesion to the promontory. Type II: adhesion to the promontory and IS joint) 1. Significant fibrosis in the attic, mastoid cavity and the circumference of the IS joint. 2. The anterior area of the merotympnum and tympanic orifice had good aeration. From the two cases studied above and those previously investigated by Dr Ishii, we guessed that Type I and II adhesive otitis media may be caused by fibrosis in the attic mastoid cavity and the circumference of th e IS joint.
