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William Osebold, MD; Kenneth C. Moore, MF

Arch Neurol. 1979;36(1):35-37.

Abstract
• A plexiform neurofibroma was unusual in that it extensively infiltrated the main trunk and branches of the left facial nerve without compromising function, rather than forming a circumscribed, compressive mass.

Histologic sections showed diffuse involvement of even minute branches of the facial nerve. Electron microscopy disclosed Schwann cell and fibroblastic proliferation in a collagenous matrix. Collagen fibrogenesis by fibroblasts, but not by Schwann cells, was noted. Many of the Schwann cells were free of any association with nerve axons, which suggests that some release of the Schwann cell from its usually well-defined functions is involved in neurofibroma formation.

Author Affiliations
From the Departments of Orthopaedic Surgery (Dr Osebold) and Biochemistry (Dr Moore), The University of Iowa, Iowa City.

Footnotes
Accepted for publication Oct 19, 1977.

Reprint requests to Department of Orthopaedic Surgery, University of Iowa, Iowa City, IA 52242 (Dr Osebold).

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