title: Spindle cell lipoma of the floor of the mouth. A case report.
abstract: A sessile swelling in the floor of the mouth appeared three years ago in a 29-year old Caucasian female located laterally to the opening of the right duct of Wharton. The mass covered by normal looking mucosa exhibited slight growth since then. After excision, histological examination revealed the presence of a tumor formed by areas of mature adipose cells interspersed with extensions of tightly disposed fusiform fibroblasts immunoreactive for vimentin and CD-34. There were foci of concentric fibroblasts forming dense whorls. When large these conglomerates exhibited chondrocytes in the center. Mast-cells were not rare throughout the fibroblastic areas. No signs of malignancy occurred. These features led to the diagnosis of a spindle cell lipoma with chondrous metaplasia. The relative rarity of such a tumor in this location, especially in the chondrous variety, was considered worth of presentation, while the differential diagnosis with other intraoral tumors, namely mucoceles, dermoid cysts, mesenchymomas, fibromas and myxomas of the floor of the mouth, is discussed.
authors.affiliation: Department of Oral Medicine, Faculty of Dental Medicine, University of Porto, Portugal. filipecoimbra@netcabo.pt
authors.forename: Felipe
authors.initials: F
authors.lastname: Coimbra
authors.forename: J M
authors.initials: JM
authors.lastname: Lopes
authors.forename: Helena
authors.initials: H
authors.lastname: Figueiral
authors.forename: Crispian
authors.initials: C
authors.lastname: Scully
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008067:Lipoma / Q000473:pathology*; D009060:Mouth Floor / Q000473:pathology; D009062:Mouth Neoplasms / Q000473:pathology*