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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.

What is your diagnosis? (87)

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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.

Your answers are highlighted below.
Question 1
What is your diagnosis?
A
Bovine cysticercosis
B
Cysticercus tenuicollis
C
Cysticercus bovis
D
Cysticercus cellulosae
E
Valvular cyst
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