title: Unusual dermoid cyst in oral cavity.
abstract: Dermoid cysts in oral cavity are unusual lesions. Their etiology is not yet clear and can be associated with trapped cells as a result of the inclusion error resulting in the development into the ectoderm, mesoderm, and endoderm tissues. The aim of this case report is to evidence the presence of a dermoid cyst in the floor of mouth surgically removed. In the present case, the lesion showed soft consistency, floating, regular borders, smooth surface, and the same color as the adjacent mucosa, asymptomatic and measuring 4.5 × 5.5 cm in its greatest diameter. The initial diagnostic was ranula in consequence of the similarity with clinical characteristics and localization. After surgical removal lesion, a fibrotic capsule was identified with a friable material with intensive yellow color. The microscopic exam showed cystic lesion with cavity lined by squamous stratified epithelium hyperorthokeratinized. Cutaneous attachments, such as sebaceous glands and hair follicles, were present in connective adjacent tissue. Surgical intervention is elective in these situations. All dentists must have a thorough knowledge of this unusual lesion.
authors.affiliation: Department of Post-Graduation in Integrated Dental Sciences, University of Cuiabá, Avenida Beira Rio 3100, 78025-190 Cuiabá, MT, Brazil.
authors.forename: Evanice Menezes Marçal
authors.initials: EM
authors.lastname: Vieira
authors.affiliation: Department of Post-Graduation in Integrated Dental Sciences, University of Cuiabá, Avenida Beira Rio 3100, 78025-190 Cuiabá, MT, Brazil.
authors.forename: Alvaro Henrique
authors.identifier: 0000-0001-9510-6542
authors.initials: AH
authors.lastname: Borges
authors.affiliation: Department of Post-Graduation in Integrated Dental Sciences, University of Cuiabá, Avenida Beira Rio 3100, 78025-190 Cuiabá, MT, Brazil.
authors.forename: Luis Evaristo Ricci
authors.initials: LE
authors.lastname: Volpato
authors.affiliation: Department of Post-Graduation in Integrated Dental Sciences, University of Cuiabá, Avenida Beira Rio 3100, 78025-190 Cuiabá, MT, Brazil.
authors.forename: Alessandra Nogueira
authors.initials: AN
authors.lastname: Porto
authors.affiliation: Department of Post-Graduation in Integrated Dental Sciences, University of Cuiabá, Avenida Beira Rio 3100, 78025-190 Cuiabá, MT, Brazil.
authors.forename: Artur Aburad
authors.initials: AA
authors.lastname: Carvalhosa
authors.affiliation: Department of Post-Graduation in Integrated Dental Sciences, University of Cuiabá, Avenida Beira Rio 3100, 78025-190 Cuiabá, MT, Brazil.
authors.forename: Gilberto de Almeida
authors.initials: Gde A
authors.lastname: Botelho
authors.affiliation: Department of Post-Graduation in Integrated Dental Sciences, University of Cuiabá, Avenida Beira Rio 3100, 78025-190 Cuiabá, MT, Brazil ; Post-Graduate Program in Dentistry, CEUMA University, 01 Josue Montello, 65075-120 São Luis, MA, Brazil.
authors.forename: Matheus Coelho
authors.initials: MC
authors.lastname: Bandeca