Journal of the Selva Andina Animal Science (Oct 2020)
Ovine fibrosarcoma in the plateau high lands of Peru: Case report
Abstract
Neoplastic diseases affect notoriously the health of the sheep and therefore, the profitability of the breeding of this species. In order to perform a macro and microscopic study of two cases of abdominal cancer, a sheep was taken (case 1) from the district of Umachiri, province of Melgar, north zone of the department of Puno, and another sheep (case 2) from the district of Laraqueri, province of Puno, southwest area of the same department; both zones belong to the Peruvian sector of the Collao plateau high lands. The two specimens were suffering from chronic weakening disease without response to any therapeutic scheme. The two ewes were received as pathological cases to be studied in the Course of General Veterinary Pathology of the Faculty of Veterinary Medicine and Zootechnics (FMVZ) of the National University of Altiplano in Puno city (UNAP). Both animals were sacrificed by euthanasia using sodium pentobarbital. Necropsy was performed in both cases in the FMVZ's Laboratory of Macroscopic Pathology of UNAP, tumor tissue samples were taken for the microscopic study; The samples were processed in the Histopathology Laboratory of the aforementioned faculty. The results were as follows: macroscopically, in the abdominal cavity of case 1, numerous whitish nodules were observed, with irregular edges, firm to the touch invading adjacent tissues including numerous mesenteric lymph nodes; in the mesentery of case 2, a single whitish nodule of firm consistency was observed, with very irregular borders and quite invasive to adjacent intestinal loops; microscopically, in both cases, anaplastic fibrous tissue was observed, conformed by pleomorphic fibroblasts, some multinucleated and atypical; in case 1, in addition, numerous necrotic tumor tissue in process of calcification foci were found. These macroscopic findings of nodular-pale lesions, irregularly shaped, firm to the touch, and resistant to cut; that when examined microscopically, poorly differentiated fibrous tissue was observed, in these two cases studied, allow us to conclude that they correspond to fibrosarcoma and the case 1 was a terminal one.
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