Cholesteatoma of the tympanic part of the temporal bone.

This article presents accounts of two patients with cholesteatoma of the tympanic part of the temporal bone, located immediately lateral to the tympanic annulus (and with an intact tympanic membrane). The lesions were located deep in the anterior and inferior walls of the canal, especially in the vaginal process of the tympanic part. These more severe cases required surgical correction (removal of the sac of cholesteatoma) with very good results. Pathogenesis and differential diagnosis are discussed.