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The ultrastructure of the neurilemmoma has been compared with that of the neurofibroma. Large aggregates of extremely thin cytoplasmic processes characterize Antoni type A neurilemmoma tissue. In Antoni type B tissue, the tumor cells present as globular structures containing many organelles and osmophilic material. The neurofibroma consists of widely scattered cells which closely resemble non‐neoplastic Schwann cells. Although the patterns of the 2 tumors are widely different, morphological evidence is presented which supports the concept that both of the lesions arise from Schwann cells. Some features of a human traumatic neuroma are presented.

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