title: Palatal Osseous Choristoma.
abstract: Osseous choristoma of soft tissue in the oral cavity is rare. The choristoma is a tumor-like mass of normal cells in an abnormal location. In this report, a case of osseous choristoma of the palate in a 37-year-old male patient was reported. Approximately 6 × 5 mm pedunculated healthy colored and hard mass was observed in the median palate. The mass was surgically removed. Microscopic examination of the hematoxylin and eosin-stained sections of the mass revealed that a dense lamellar bone nodule was surrounded by fibrous connective tissue under the squamous epithelium. Immunohistochemical analysis revealed that the mass was negative for S-100 protein, cytokeratin, and epithelial membrane antigens. According to these findings, the final pathologic diagnosis confirmed that the mass was an osseous choristoma.
authors.affiliation: *Department of Oral and Maxillofacial Surgery, Tokyo Women's Medical University, School of Medicine, Tokyo, Japan †Clinic of Craniomaxillofacial and Oral Surgery, Medical University of Innsbruck, Innsbruck, Austria ‡Department of Surgical Pathology, Tokyo Women's Medical University, School of Medicine, Tokyo, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Sasaki
authors.forename: Tomoko
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Ando
mesh_terms: D000328:Adult; D001842:Bone and Bones / Q000473:pathology*; D002828:Choristoma / Q000175:diagnosis*; D003238:Connective Tissue / Q000473:pathology; D004848:Epithelium / Q000473:pathology; D006253:Haversian System / Q000473:pathology; D006801:Humans; D008297:Male; D009059:Mouth Diseases / Q000175:diagnosis*; D009061:Mouth Mucosa / Q000473:pathology*; D010006:Osteoblasts / Q000473:pathology; D010011:Osteocytes / Q000473:pathology; D010159:Palate / Q000473:pathology*