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Updated: Jul 5, 2026
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Necropsy-based Wild Fish Health Assessment
Published on: September 11, 2018
Hemangiosarcoma in a South American sea lion (Otaria byronia)
Mi-Hyeon You1, Il-Hong Bae, Hyang Jee
1Laboratory of Veterinary Pathology, College of Veterinary Medicine, Seoul National University, Seoul 151-742, Korea.
Abstract:
A 10-yr-old male South American sea lion (Otaria byronia) died after several weeks of depression, anorexia, weight loss, and progressive respiratory distress. At necropsy, three confluent, lobulated, dark-red masses were noted in the mesentery. Similar masses were also observed in the lung and both kidneys. Hemangiosarcoma was diagnosed based on gross findings, histopathology, and immunohistochemistry. This is the first case of hemangiosarcoma reported in pinnipeds.