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Background and Objectives:Anterior attic bony plate (cog) is a coronally oriented bony septum which is suspended from important pathway for anterior drainage which can cause inflammation in obstructed conditions;therefore, it needs approp-riate procedure to eradicate the lesions without recurrence. We aimed to classify types of the anterior attic bony plates on the temporal bone CT and to find corelation betwen the types of the anterior attic bony plates and the development of chronic otitis media and cholesteatoma. Materials and Methods:We reviewed 264 cases of the temporal bone CT of the normal and the chronic otitis media patients, of which 64 cases were excluded as lesions could not be identified due to severe destruction and obscurity of the figure. Results:In normal ears, the incidence of the anterior attic bony plate was 67% in the plate type, 28% in the pyramid type, and 5% in the anterior type. In the diseased ear, the incidences were 40%, 44%, 16%, in the plate type, pyramid type, and anterior type, respectively and in the cholesteatoma ear, 30%, 43%, 27%, respectively. The diference of incidence was statistically significant. Conclusion:We assumed that the development of the chronic otitis media is related than in noncholesteatoma with a statistical significance. Further studies are needed to figure out the correlation between the type of the anterior attic bony plate and its clinical importance. (Korean J Otolaryngol 2002;45:122-6)