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A COPD patient has apical cavities and calcified nodes on his CXR. You also discover he has a pet bat and a few birds. What is the most likely diagnosis?

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Final answer:

The most likely diagnosis for a COPD patient with apical cavities and calcified nodes on CXR, who also has a pet bat and a few birds, is cryptococcosis, a form of fungal pneumonia.

Step-by-step explanation:

The patient with COPD, apical cavities, and calcified nodes on chest X-ray (CXR), who also has a pet bat and birds, is most likely suffering from cryptococcosis. Cryptococcosis is a fungal pneumonia caused by the encapsulated yeast Cryptococcus neoformans, which is commonly found in bird droppings and can also be associated with bat guano. In this scenario, the exposure to these pets and their droppings may have led to the development of the fungal infection, which is consistent with the radiographic findings.

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