At the end of the post you can vote for the right diagnosis!

In a six months old mixed breed pig lymphadenopathy of the mediastinal lymph nodes was found along with obscured areas of the lungs diaphragmatic lobes.

Lymphadenopathy of the mediastinal lymph nodes and obscured areas in the lung diaphragmatic lobes.

Lymphadenopathy of the mediastinal lymph nodes and obscured areas in the lung diaphragmatic lobes.

When sectioned the lymph nodes showed a blackish-reddish coloration.

When sectioned the lymph nodes showed a blackish-reddish coloration.

What is your diagnosis? (10)

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Histopathology showed intense blood resorption in the lymph nodes along with the presence of non-lymphoid poligonal cells, grouped in clusters and with dark brown pigment in the cytoplasm (melanocytes). In the lung parenchyma only black pigment-laden macrophages were obserevd.

 

The figure below shows the primary neoplasia found on the skin of the pig. The lesion found in the lymph nodes is interpreted as a metastatic melanoma, the lung lesion was apparently only pigment resorption.

 

Click the following link for more information on porcine melanomas.

Black nodular lesion in the side of the carcass.

Black nodular lesion in the side of the carcass.


Your answers are highlighted below.
Question 1
A
Antracosis (carbon resorption)
B
Blood resorption
C
Metastatic melanoma
D
Melanosis maculosa
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