Odontoameloblastoma with extensive chondroid matrix deposition in a guinea pig

Wong, H E; Hedley, J; Stapleton, N; Murphy, B; Priestnall, S L

Abstract

Odontoameloblastomas (previously incorporated within ameloblastic odontomas) are matrix-producing odontogenic mixed tumors and are closely related in histologic appearance to the 2 other types of matrix-producing odontogenic mixed tumors: odontomas and ameloblastic fibro-odontomas. The presence or absence of intralesional, induced non-neoplastic tissue must be accounted for in the diagnosis. Herein we describe a naturally occurring odontoameloblastoma with extensive chondroid cementum deposition in a guinea pig (Cavia porcellus). Microscopically, the mass featured palisading neoplastic odontogenic epithelium closely apposed to ribbons and rings of a pink dental matrix (dentinoid), alongside extensive sheets and aggregates of chondroid cementum. The final diagnosis was an odontoameloblastoma given the abundance of odontogenic epithelium in association with dentinoid but a paucity of pulp ectomesenchyme. Chondroid cementum is an expected anatomical feature of cavies, and its presence within the odontoameloblastoma was interpreted as a response of the ectomesenchyme of the dental follicle to the described neoplasm. Our case illustrates the inductive capabilities of odontoameloblastomas while highlighting species-specific anatomy that has resulted in a histologic appearance unique to cavies and provides imaging and histologic data to aid diagnosis of these challenging lesions.

Citation

Wong, H. E., Hedley, J., Stapleton, N., Murphy, B., & Priestnall, S. L. (2018). Odontoameloblastoma with extensive chondroid matrix deposition in a guinea pig. Journal of Veterinary Diagnostic Investigation, https://doi.org/10.1177/1040638718794784

• Journal Article Type: Article
• Acceptance Date: Aug 1, 2018
• Publication Date: Aug 22, 2018
• Deposit Date: Aug 25, 2018
• Publicly Available Date: Aug 28, 2018
• Journal: JOURNAL OF VETERINARY DIAGNOSTIC INVESTIGATION
• Print ISSN: 1040-6387
• Publisher: SAGE Publications
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1177/1040638718794784
• Public URL: https://rvc-repository.worktribe.com/output/1386194