Computed Tomography of the Mandibles of a Stranded Offshore Killer Whale (Orcinus orca)
| Autor: | Martin Haulena, Joseph K. Gaydos, Michael A. Etnier, J. N. Winer, Tori McKlveen, Martha A. Delaney, L. Legendre, Karisa N. Tang |
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| Rok vydání: | 2019 |
| Předmět: |
medicine.medical_specialty
040301 veterinary sciences Radiography Dentistry Computed tomography Mandible 030308 mycology & parasitology Pathology and Forensic Medicine 0403 veterinary science 03 medical and health sciences biology.animal Animals Medicine Periodontal Diseases Cause of death 0303 health sciences General Veterinary medicine.diagnostic_test biology business.industry Whale 04 agricultural and veterinary sciences Tooth Diseases Pulp (tooth) Female Histopathology Whale Killer medicine.symptom Tomography X-Ray Computed business Emaciation Gingival margin |
| Zdroj: | Journal of Comparative Pathology. 168:35-40 |
| ISSN: | 0021-9975 |
| Popis: | A mature, adult female, offshore killer whale (Orcinus orca) was stranded deceased in Portage Bay, Alaska, in October 2015. Full necropsy examination with histopathology was performed. Consistent with previous studies of offshore killer whales, and thought to be a result of their unique elasmobranch diet, all the teeth were significantly abraded and almost flush with the gingival margin. Age was estimated at 30-35 years based on annuli and growth arrest lines in a remaining tooth. The dentate portion of the mandibles were excised en bloc and frozen until imaging could be completed. Radiography and computed tomography revealed lesions consistent with severe abrasion, pulp exposure and evidence of endodontic and/or periodontal disease in nine of the 15 mandibular teeth present (60.0%). Only five (33.3%) teeth were suspected to have been vital at the time of death based on imaging. Lesions were more severe rostrally, with the caudal teeth less affected. Autolysis precluded gingival histopathology and no teeth were analyzed histologically. Necropsy examination revealed a likely multifactorial cause of death, with most significant lesions including the severe chronic periodontal/endodontic disease with abrasion, inanition and emaciation with possible cardiovascular disease. This case highlights the importance of imaging in evaluating periodontal and endodontic status, especially post mortem when other tissues are no longer available, and demonstrates that periodontal and endodontic disease occur naturally in this species and can be a significant cause of morbidity in mature free-ranging killer whales of the offshore ecotype. |
| Databáze: | OpenAIRE |
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