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1 June 2013 DIAGNOSIS AND TREATMENT CONSIDERATIONS IN A CASE OF MALIGNANT MESENCHYMOMA IN AN AFRICAN FUR SEAL (ARCTOCEPHALUS PUSILLUS)
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Abstract

A 20-yr-old African fur seal (Arctocephalus pusillus) presented with a slowly growing mass located on the dorsum at the level of the last thoracic vertebrae. The mass was hard, 10 cm in diameter, and not adherent to the underlying tissues. Multiple biopsies were collected for histopathology and revealed extensive areas of necrosis, small nodules of malignant mesenchymal proliferation with areas of chondroid metaplasia, and atypical cells in vessel walls. The morphologic diagnosis was suggestive of malignant mesenchymal neoplasia originating from the vascular wall. The mass was removed 1 mo later due to ulceration and infection. Histologically, based on the World Health Organization's classification of neoplastic processes in domestic animals, the tumor was consistent with malignant mesenchymoma. The margins of resection revealed the presence of neoplastic cells. Based on these results, the particular species involved, the high local invasiveness, and the high metastatic index of this malignant tumor in domestic mammals and humans, the prognosis was poor. The animal died 6 mo later with metatastic disease.

American Association of Zoo Veterinarians
Pietro Laricchiuta, Marco Campolo, Paolo Martelli, Angela Cantore, Giuseppe Menga, Giovanni Tortorella, Isidoro G. Grillo, Giuseppe de Ruvo, Donatella Gelli, and Olimpia R. Lai "DIAGNOSIS AND TREATMENT CONSIDERATIONS IN A CASE OF MALIGNANT MESENCHYMOMA IN AN AFRICAN FUR SEAL (ARCTOCEPHALUS PUSILLUS)," Journal of Zoo and Wildlife Medicine 44(2), 466-469, (1 June 2013). https://doi.org/10.1638/2012-0004R2.1
Received: 22 February 2012; Published: 1 June 2013
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