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In a 12-month-old cross-breed calf the presence of two cysts is observed in the atrioventricular valves. They measure around 1cm in diameter, the walls are transparent and contain a clear serous liquid. Inspectors submit samples on suspicion of bovine cysticercosis.
Calf, 12m. Atrioventricular valves cysts.
Detail of one of the cysts, multilobulated.
Detail of the other cyst.
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The histopathological study shows a cystic cavity lined by a simple flat endothelium. The absence of any inflammatory infiltrate or of structures that suggest a parasitic origin, rules out a diagnosis of cysticercosis. The diagnosis therefore consists of a valvular cyst of probable congenital origin. Bovine cysticercosis could be ruled out since its lesions correspond to vesicles in the myocardium with a scolex inside it or, if the host has already reacted against the cyst, granulomas in the myocardium.
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