鼓膜正常な中耳(鼓室)真珠腫

抄録

mesotympanum were reported. All these ears had erosion of the long process of the incus and of the stapes superstructure.
In two of these five patients with intact tympanic membrane the appearance of a white mass was noted behind a translucent drum at diagnosis.
Of these cholesteatomas, four were in children whose ages ranged from five to nine years, and one was twenty years. The parents of all patients denied any previous history of aural infections.
The etiology of the presented cases is discussed on the basis of the congenital origin.