ear a bony deficit with consequent herniation of brain tissue into the middle ear should be ruled out . Three cases of heterotopic brain tissue in the middle ear associated with cholesteatoma have been reported . It is possible that in all three, brain herniation occurred as a result of inflammatory damage to the tegmen tympani. Spontaneous herniations of brain (encephaloceles) may occur into the middle ear through a congenital deficiency of the tegmen or other sites .
A case of sebaceous choristoma of the middle ear has been described .
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