Peliose hepática em Lontra longicaudis (Olfers, 1818)

Abstract

Peliosis is a pathology characterized by the gross appearance of multiple blood-filled, cyst-like cavities within parenchymal organs, which may be related to the underlying pathogenic mechanisms of onset and maintenance of the pathology, with more than one path of formal pathogenesis. . The objective of this work is to report a case of peliosis hepatis in a common otter (Lontra longicaudis) found in the Cuiabá river, in Cuiabá-MT, and taken for clinical treatment at the Veterinary Hospital of the Federal University of Mato Grosso. In the post-mortem findings, at macroscopy, the lungs presented dark red irregular multifocal areas in the right cranial and caudal lobes and in the left caudal lobes. The liver was diffusely yellowish, increased in size (approximately twice the size), with rounded edges, markedly friable and with marked evidence of the lobular pattern. In the lung, microscopically, there was fibrinoid necrosis of arterioles, with fibrin thrombi obliterating the vascular lumen. The alveoli were diffusely thickened, associated with proliferation of pneumocytes and lymphocytic infiltrate, with hyaline membranes that fill and obliterate the lumen. The pleura and subpleural adjacencies were thickened by mild to moderate mixed infiltrate. On liver microscopy, in all sections the lobular hepatocellular parenchyma was markedly disorganized, containing cystic spaces of varying sizes, often paved by endothelium, filled with erythrocytes. The samples collected using sterile swabs from the cultured lung resulted in the growth of bacteria of the genus Pseudomonas sp. Thus, it is concluded that the animal died due to respiratory complications, the cause of death being bacterial pneumonia, and peliosis hepatis, found in the post-mortem examination, a finding and its report is unprecedented in the literature.