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In the lung of a 20-year-old cross-breed cow carcass a cavitary lesion is observed, about 5 cm in diameter and granulomatous in appearance, the meat inspectors submit it as a tuberculosis compatible lesion.

Intraparenchymal cavity lesion containing caseous-looking material inside, located in the right cardiac lobe.

 

What is your diagnosis? (89)

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The lesions observed in the histopathological study consisted of a circumscribed and cavitated intraparenchymal lesion surrounded by a coarsely spheroidal fibrous reaction. Abundant pyogranulomatous and eosinophilic inflammatory content with cellular detritus and a large number of discontinuous and folded fragments of an intensely eosinophilic and hyaline membranous structure was seen inside the -cystic- cavity. Such membranes were surrounded by a very intense granulomatous reaction, very vigorous and orderly, with dense delimiting proliferation of epithelioid cells, multinucleated giant cells, activated macrophages, and abundant eosinophils and neutrophils. The lesion is characteristic of a hydatid cyst (Echinococcus granulosus) (inflamed and involuted, ie non viable), the suspicion of tuberculosis is ruled out, but it should be noted that the inspectors did well to submit it as a suspicion of Tuberculosis since, macroscopically, this diagnosis could not be ruled out.

Your answers are highlighted below.
Question 1
What is your diagnosis?
A
Tuberculosis (Mycobacterium bovis)
B
Tuberculosis (Mycobacterium caprae)
C
Hydatidosis (Echinococcus granulosus)
D
Lung carcinoma
E
Pulmonary sequestrum (Mannheimia haemolytica)
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