[A case report of primary neurinoma of the middle ear].

A neurinoma was confirmed in the tympanum and attic of the reoperative case of chronic otitis media of 53-year-old female, whose right middle ear surgery 12 years ago had facial nerve paralysis of the same side immediately after the operation. The granulation tissue filling the tympanum and the attic was solid and thick. The anterior part of the attic wall was destroyed and the dura of the middle fossa was exposed. The mastoid cavity was filled with the granulation tissue, but in these tissues neurinomatous findings was not found. The authors suspect from the operative findings that this neurinoma might have originated from the facial nerve at its first genu, where the bone resorption was remarkable. But the relationship between the damage of the facial nerve at the previous operation and growth of neurinoma was not clarified.