title: Primary intraoral leiomyosarcoma of the tongue: an immunohistochemical study and review of the literature.
abstract: Leiomyosarcoma is a relatively uncommon mesenchymal tumor that exhibits smooth-muscle differentiation. We report a new case of leiomyosarcoma involving the tongue of a 67-year-old male. Histologically, the tumor was composed of variably oriented fascicles of spindle-shaped cells with 'cigar-shaped' nuclei and eosinophilic cytoplasm, containing occasional PAS-positive granules. Atypical mitotic figures and necrotic foci were frequently detected. Consistent desmin, alpha-smooth muscle-specific and sarcomeric actin, and vimentin immunoreactivity was demonstrated in the tumor cells, whereas cytokeratins, CD 30, CD 31, CD 34, CD 45, CD 68, EMA, GFAP, HMB 45 and S-100 protein were negative. The patient underwent wide surgical excision of the tumor and is alive and disease-free at a 5-year follow-up. This report emphasizes the difficulties in the differential diagnosis of these uncommon tumors in an intra-oral location.
authors.affiliation: Department of Dentistry and Surgery, University of Bari, Bari, Italy. llomuzio@tin.it
authors.lastname: Lo Muzio L
authors.forename: G
authors.initials: G
authors.lastname: Favia
authors.forename: M D
authors.initials: MD
authors.lastname: Mignogna
authors.forename: A
authors.initials: A
authors.lastname: Piattelli
authors.forename: E
authors.initials: E
authors.lastname: Maiorano
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D007890:Leiomyosarcoma / Q000473:pathology*; D008297:Male; D012983:Soft Tissue Neoplasms / Q000473:pathology*; D014062:Tongue Neoplasms / Q000473:pathology*