title: Atypical soft tissue perineurioma in the tongue of a young girl.
abstract: Perineuriomas are uncommon benign peripheral nerve sheath tumors that include soft tissue, sclerosing, reticular, and intraneural variants. Soft tissue perineuriomas arise in a wide anatomic distribution and mostly in patients older than 20 years of age. We report an atypical perineurioma in a 7-year-old girl. The tumor, located in the tongue, was uniformly hypercellular. The tumor cells were spindle-shaped with a slender, elongated, bipolar, wavy cytoplasmic process formation and wavy elongated nuclei, and the architecture was composed of predominantly short fascicles with areas exhibiting a vague storiform pattern. Although the tumor cells generally appeared bland, the tumor showed worrisome features including an infiltrative pattern and occasional mitotic figures. Psammoma bodies were observed in the periphery of the tumor. Immunohistochemically, the cells were positive for epithelial membrane antigen, vimentin, claudin-1, and GLUT-1, but negative for S-100 protein, CD34, and type IV collagen. The authors document a case of soft tissue perineurioma with atypical histological features that occurred in the tongue of a child.
authors.affiliation: Department of Pathology, City Hospital of Toyonaka, Osaka, Japan. shiro-adachi@chp.toyonaka.osaka.jp
authors.forename: Shiro
authors.initials: S
authors.lastname: Adachi
authors.forename: Reiko
authors.initials: R
authors.lastname: Doi
authors.forename: Kenji
authors.initials: K
authors.lastname: Mitani
authors.forename: Yoriko
authors.initials: Y
authors.lastname: Iwamoto
authors.forename: Ayumi
authors.initials: A
authors.lastname: Furumoto
authors.forename: Maki
authors.initials: M
authors.lastname: Yamashita
authors.forename: Hironori
authors.initials: H
authors.lastname: Cho
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D018317:Nerve Sheath Neoplasms / Q000378:metabolism / Q000473:pathology*; D012983:Soft Tissue Neoplasms / Q000378:metabolism / Q000473:pathology; D014062:Tongue Neoplasms / Q000378:metabolism / Q000473:pathology*