Abstract
Soft tissue type perineuriomas (STP) are uncommon tumors, oral examples being very rare. They have been described in the mandible, gingiva, lips, retrotonsillar mucosa and maxillary vestibule. Herein, we report the clinicopathologic features of five STP, two affecting the buccal mucosa and three the mandible. Three patients were women and two men. All tumors were characterized by a proliferation of cytologically bland, mitotically inactive spindled cells with round, ovoid or spindled nuclei, embedded in a variably collagenous and myxoid matrix. Interestingly, two mandibular tumors featured psammoma bodies and one, in addition, contained irregular calcifications. Tumor cells showed the immunohistochemical profile of perineurial cells including epithelial membrane antigen, Glut-1, claudin-1 and collagen type IV. S100 and neurofilament proteins were not expressed by the tumor cells. A few minute, peripherally situated, entrapped nerves were identified. All tumors were reported gross-totally excised and no recurrences have taken place. The clinical characteristics of STP are summarized and its differential diagnosis relative to other spindle cells tumors and meningioma is discussed.
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Acknowledgments
The authors are indebted to Ms. BreAnne MacKenzie and Mr. Brock Tidstrom (University of Minnesota) for their invaluable assistance in identifying the archived histologic slides and paraffin blocks, and tabulating the data of the oral peripheral nerve sheath tumor study, to Mr. Jonathan Henriksen (University of Minnesota) for his superb assistance with the illustrations, and Mrs. Denise Chase (Mayo Clinic), for her secretarial assistance.
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Koutlas, I.G., Scheithauer, B.W. & Folpe, A.L. Intraoral Perineurioma, Soft Tissue Type: Report of Five Cases, Including 3 Intraosseous Examples, and Review of the Literature. Head and Neck Pathol 4, 113–120 (2010). https://doi.org/10.1007/s12105-010-0177-3
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DOI: https://doi.org/10.1007/s12105-010-0177-3