Hi
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A solitary nodule in lung area (sub-pleural) can be carcinoid syndrome, tuberculosis, sarcoidosis, hematoma, hamartomas, chondromas, pneumonia, lymphoma or cancer. You must consult a chest specialist, a different one if this treatment is not helping and get this evaluated completely. Take care!
I'd get 5 second opinions. Research who the best doctors are in your area and get in with them asap.
If i were you i,d get a second opinion it,s always best to get things checked out especally if your symptoms persisit