title: Nasal tissue-derived hamartoma in the maxillary gingiva of a calf.
abstract: BACKGROUND
  All of oral hamartomas has been previously found in mandibular gingiva in younger calves, and were histologically diagnosed as a vascular hamartoma. This is the first case report describing a calf with a mass in the maxillary gingiva that was histologically diagnosed as a nasal tissue-derived hamartoma.
  
  
  METHODS
  A 13-day-old male Holstein calf presented with a horn-like mass in the left rostral maxillary gingiva. Surgical removal revealed that the mass had a dual structure composed of cartilaginous and soft tissues and extended deeply toward the nasal cavity. Excised tissues mainly consisted of two types of mature cells without mitotic figures and atypia: 1) the cartilage-like structures consisted of an island and a meandering massive focus of mature cartilaginous tissues, and 2) tubular structures consisting of stratified ciliated mucosal columnar cells with gland-like structures and aggregated goblet cells. The mass was diagnosed as a nasal tissue-derived hamartoma because these two types of structures were histologically identical to nasal structures. The present case had no recurrence at 1 year after surgery.
  
  
  CONCLUSIONS
  To our knowledge, this is the first description of the calf with nasal tissue-derived hamartoma in the maxillary gingiva.
authors.affiliation: Department of Veterinary Clinical Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101, Koyama-Minami, Tottori, Tottori, Japan. tsuka@muses.tottori-u.ac.jp.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Tsuka
authors.affiliation: Department of Veterinary Clinical Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101, Koyama-Minami, Tottori, Tottori, Japan.
authors.forename: Takehito
authors.initials: T
authors.lastname: Morita
authors.affiliation: Tobu Veterinary Clinic, Tottori Prefectural Federation Agricultural Mutual Aid Association, 210-19, Takadote, Kuniyasu, Tottori, Tottori, Japan.
authors.forename: Hinako
authors.initials: H
authors.lastname: Tanaka
authors.affiliation: Tobu Veterinary Clinic, Tottori Prefectural Federation Agricultural Mutual Aid Association, 210-19, Takadote, Kuniyasu, Tottori, Tottori, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Kono
authors.affiliation: Department of Veterinary Clinical Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101, Koyama-Minami, Tottori, Tottori, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Murahata
authors.affiliation: Department of Veterinary Clinical Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101, Koyama-Minami, Tottori, Tottori, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Azuma
authors.affiliation: Department of Veterinary Clinical Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101, Koyama-Minami, Tottori, Tottori, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Osaki
authors.affiliation: Department of Veterinary Clinical Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101, Koyama-Minami, Tottori, Tottori, Japan.
authors.forename: Norihiko
authors.initials: N
authors.lastname: Ito
authors.affiliation: Department of Veterinary Clinical Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101, Koyama-Minami, Tottori, Tottori, Japan.
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Okamoto
authors.affiliation: Department of Veterinary Clinical Medicine, School of Veterinary Medicine, Faculty of Agriculture, Tottori University, 4-101, Koyama-Minami, Tottori, Tottori, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Imagawa
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000473:pathology*; D005881:Gingiva; D005882:Gingival Diseases / Q000473:pathology / Q000662:veterinary*; D006222:Hamartoma / Q000473:pathology / Q000662:veterinary*; D008297:Male; D008437:Maxilla / Q000473:pathology; D009296:Nasal Cavity / Q000473:pathology