title: Solitary fibrous tumor with malignant potential arising in sublingual gland.
abstract: A rare case is described of a solitary fibrous tumor (SFT) with malignant potential arising in the sublingual gland. A 59-year-old man presented with a 4-month history of a slowly enlarging painless mass in the center of the floor of the mouth. The tumor was a well-demarcated, firm mass with a multicystic lesion. The tumor exhibited highly cellular areas of spindle cells with patternless architecture alternating with hypocellular areas. The tumor cells were positive for CD34 and bcl-2 as well as vimentin, and negative for epithelial, myogenic, neurogenic and histiocytic markers. The tumor cells formed multiple satellite nodules around dilated ducts in the multicystic lesion, indicating infiltrative growth. In addition, areas exhibiting higher cellularity with increased mitoses were noticed in the satellite nodules, although cellular atypia was not obvious. These findings led to a final diagnosis of SFT with malignant potential. There has been no recurrence or metastasis for 27 months after the surgery. Solitary fibrous tumor of the salivary gland must be differentiated from various spindle cell neoplasms including myogenic, peripheral nerve sheath, fibroblastic and fibro-histiocytic spindle cell neoplasms, hemangiopericytoma and myoepithelioma. In addition to characteristic morphological features, an immunohistochemical positivity for CD34 and bcl-2 may aid in the diagnosis of SFT.
authors.affiliation: Clinical Laboratory, Hiroshima University Dental Hospital, Hiroshima University, Hiroshima, Japan. dlabo@hiroshima-u.ac.jp
authors.forename: Ikuko
authors.initials: I
authors.lastname: Ogawa
authors.forename: Sunao
authors.initials: S
authors.lastname: Sato
authors.forename: Yasusei
authors.initials: Y
authors.lastname: Kudo
authors.forename: Mutsumi
authors.initials: M
authors.lastname: Miyauchi
authors.forename: Masaru
authors.initials: M
authors.lastname: Sugiyama
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Suei
authors.forename: Takashi
authors.initials: T
authors.lastname: Takata
mesh_terms: D018952:Antigens, CD34 / Q000032:analysis; D014408:Biomarkers, Tumor / Q000032:analysis; D005350:Fibroma / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000032:analysis; D013361:Sublingual Gland / Q000000981:diagnostic imaging / Q000473:pathology*; D013362:Sublingual Gland Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014746:Vimentin / Q000032:analysis
chemical_list: D018952:Antigens, CD34; D014408:Biomarkers, Tumor; D019253:Proto-Oncogene Proteins c-bcl-2; D014746:Vimentin