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Images were submitted froam a cow with cystic lesions in the liver and lung parenchyma.

Liver lesions.

Cavitary lesions in the lung.

Detail of the liver cysts.

Detaol of the wall of one of the lung’s cysts.

Content of some of the vesicles.


What is your diagnosis? (65)


The images are compatible with a parasitic lesion known as hydatid cyst. It consists of the larval phase of Echicnococcus granulosus senso lato.
It should not be mistaken for an E.multilocularis case. The explanation would be that E.multilocularis does not make an adventitious layer around the cyst and has a more alveolar and infiltrating appearance in tissues. The vesicles that are seen inside the cysts correspond to  daughter vesicles (secondary vesicles).
On the other hand, and reinforcing this explanation, in our territory (Catalonia) we do not have presence of this parasite and the cycle of E.multilocularis closes between carnivorous (fox, wolf, etc ...) who are the definitive guests with the Parasite in the intestine that excretes eggs in the feces and rodents (intermediate hosts that develop cysts). Accidentally, man can act as an intermediate host (zoonosis) and it has also been described in domestic species such as pigs or horses.

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Question 1
What is your diagnosis?
Cysticercus bovis
Echinococcus multilocularis
Echinococcus granulosus
Echinococcus ortleppi
Cysticercus tenuicollis
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