High resolution CT is well known excellent modality for evaluation of fine ear structures and its changes, butis nor usual method for detection of inflammatory disease of ear. Forty cases of OMPC were reviewed and advantages& limitations were also evaluated. The sesults were as follows: 1. On CT findings of OMPC, abnormalities wereexternal auditory canal in 14 cases (35%), tympanic membrane in 31 cases(77.5%), soft tissue mass in middle earcavity and/or mastoid antrum in 34 cases (85%), middle ear effusion in 9 cases (22.5%), and bony labyrinth in 5cases(12.5%). 2. Partial esosion and missing of ossicles were long process and lenticular process of incus, bodyof incus, head of malleus, and stapes in order. 3. Advantage of temporal bone CT were early detection of softtissue mass, evaluation of extent of disease, destruction of bony structure and ossicular destruction. 4.Differentiation of cholesteatoma and granulation was difficult and examination of superstructures such as stapesand facial nerve canal were limited.