Abstract
An eighth nerve traumatic neuroma was found in the vestibule of the inner ear one year after labyrinthectomy. It consisted of myelinated and unmyelinated nerve fibers twisted together among a few strands of connective tissue. Myelin sheaths of about twenty layers were formed by typical-appearing Schwann cells. An ordinary “acoustic neuroma” was compared with it by light and electron microscopy. Its cells contained numerous fine fibers and abundant rough-surfaced endoplasmic reticulum. They produced collagen fibers and myelin figures. Basement membranes and cross-banded figures were observed and lead us to regard the cells as Schwann cells rather than fibroblasts. “Schwannoma” seems to be the best name for this type of tumor.
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