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Intraosseous Neurilemmoma of the Mandible

Tatsuhiko Nakasatoa,b, Kenichi Katoha, Shigeru Eharaa, Yoshiharu Tamakawaa, Masayuki Hoshinoa, Mitsuru Izumizawaa, Kimio Sakamakia, Yoshiyasu Fukutaa and Keigo Kudoha

a From the Department of Radiology (T.N., K.K., S.E., Y.T.), Iwate Medical University School of Medicine, and the Departments of Dental Radiology (M.H., M.I., K.S.) and Oral Surgery (Y.F., K.K.), Iwate Medical University School of Dentistry, Morioka, Japan.
b Address reprint requests to Tatsuhiko Nakasato, MD, Department of Radiology, Iwate Medical University School of Medicine, 19–1 Uchimaru, Morioka 020–8505, Japan.



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  		FIG 1. 19-year-old woman with intraosseous neurilemmoma of the right side of the mandibular body.

A, Panoramic radiograph shows a well-defined, unilocular, expansive lesion in the supracanal region. No evidence of dental root resorption or dilatation of the mandibular canal was noted (arrow).

B, Axial CT scan with 1-mm slice thickness shows an expansive lytic lesion associated with incomplete septae (arrows) and cortical thinning of the lingual plate.

C, Cross-sectional reformatted images from the second molar (image 25) to the second premolar (image 36) regions show the lesion located in the supracanal mandibular body associated with defect (curved arrow) of the upper cortical margin of the mandibular canal (arrows). Thinning and defect of the buccal cortical plate of the mandible are also seen.

D, Axial T1-weighted MR image shows a well-demarcated intermediate signal lesion in the mandibular body.

E, Axial T2-weighted MR image shows a lesion with bright signal intensity.

F, Contrast-enhanced sagittal T1-weighted image shows intensive enhancement.

G, Photomicrograph of a resected specimen (hematoxylin and eosin stains; original magnification x100) shows Antoni type-A tissue (fascicular type) consisting of palisading arranged nuclei (arrow) and Verocay bodies (acellular zones).

H, Photomicrograph of a resected specimen (hematoxylin and eosin stains; original magnification x100) reveals Antoni type-B tissue (reticular type) associated with irregularly arranged, dark-stained, atrophic nuclei and myxoid degeneration (arrow).





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X