A solitary or single nodule in lung
area (sub-pleural) can be carcinoid syndrome, tuberculosis, sarcoidosis, hematoma, hamartomas, chondromas, pneumonia
, lymphoma or cancer.
A well defined opacity
in <span style = 'background-color: #dae8f4'>lung</span>
can be due to pneumonia
, cancer, tuberculosis, a benign lung
nodule, or due to an infarct. Less well defined or diffuse opacities
are usually multiple in nature and often due to inflammation, tuberculosis (military type), asbestosis, silicosis, auto-immune diseases etc.