title: Locally infiltrative ameloblastic fibroma in a rhesus macaque (Macaca mulatta) with characterizations of its proliferating activity and biological behavior.
abstract: An 8-year-old male rhesus macaque (Macaca mulatta) presented with unilateral enlargement of the left mandible. Radiographs revealed a marked expansion of the left mandible with a multilocular radiolucent mass with abundant osteolysis. The mass was grossly firm, fleshy, and gelatinous on the cut surface. Histologically, the mass was locally infiltrative and composed of neoplastic epithelial and mesenchymal components that stained positive for cytokeratin and vimentin, respectively. Occasional densely spherical condensations of fibroblasts resembling the cap stage of odontogenesis were present in the mesenchyma. Immunohistochemical staining with Ki-67, S-100, and CD34 indicated that both epithelial and mesenchymal components of the neoplasm had low proliferation. Alcian blue, periodic acid-Schiff, and trichrome stains showed an immature stromal component with no collagen formation. Based on the clinical, histologic, and immunophenotypic features, the tumor was identified as a locally infiltrative ameloblastic fibroma.
authors.affiliation: Divisions of Comparative Pathology, Tulane National Primate Research Center, 18733 Three Rivers Road, Covington, LA 70433, USA. dliu1@tulane.edu
authors.forename: David X
authors.initials: DX
authors.lastname: Liu
authors.forename: Lara A
authors.initials: LA
authors.lastname: Doyle
authors.forename: Mostafa T
authors.initials: MT
authors.lastname: Bouljihad
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Didier
authors.forename: Margaret H
authors.initials: MH
authors.lastname: Gilbert
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Wang
authors.forename: Bapi
authors.initials: B
authors.lastname: Pahar
authors.forename: Rudolf P
authors.initials: RP
authors.lastname: Bohm
authors.forename: Ronald S
authors.initials: RS
authors.lastname: Veazey
authors.forename: Andrew A
authors.initials: AA
authors.lastname: Lackner
mesh_terms: D000818:Animals; D017809:Fatal Outcome; D007150:Immunohistochemistry / Q000662:veterinary; D008253:Macaca mulatta; D008297:Male; D008339:Mandibular Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology / Q000662:veterinary*; D008992:Monkey Diseases / Q000000981:diagnostic imaging / Q000473:pathology*; D009808:Odontogenic Tumors / Q000000981:diagnostic imaging / Q000473:pathology / Q000662:veterinary*; D011859:Radiography