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Vet Pathol 42:513-516 (2005)
© 2005 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Fatal Placental Subinvolution in a Captive Capybara (Hydrochaeris hydrochaeris, Order Rodentia)

C. Juan-Sallés, L. S. Martínez and M. M. Garner

Abstract

An adult, captive-born female capybara died of systemic thrombosis and hemoperitoneum associated with placental subinvolution. Grossly, the uterus was enlarged, segmentally thickened, and associated with a large blood clot in the abdominal cavity. There was hemometra and a large ovoid mass in each uterine horn weakly adhered to the endometrium, and the right uterine horn wall had a small perforation over the mass. The mesometrial veins were markedly dilated due to thrombosis and occasionally perforated. Histologically, the uterine masses consisted of partly necrotic placental and subplacental tissue. The uterine wall surrounding the masses had full-thickness coagulative necrosis of the myometrium and diffuse endometrial ulceration with abundant syncytiotrophoblast-like cells within capillaries. Vascular lesions in the uterus and mesometrium consisted of mural invasion by cytotrophoblast and syncytiotrophoblast-like cells, thrombosis, fibrinoid necrosis, and/or heterophilic vasculitis. This is the first report of placental subinvolution in capybaras or any rodent species, to the authors' knowledge.

Key words: Capybaras; hemoperitoneum; Hydrochaeris hydrochaeris; placental subinvolution; thrombosis; trophoblast.

Request reprints from Carles Juan-Sallés, Head, Department of Pathology, ConZOOlting Wildlife Management, s.l., Serra del Montsant 6, 08415 Bigues i Riells, Barcelona (Spain). E-mail: patologia{at}conzoolting.com






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