Answer:
A lung nodule is a node that can be from infection, scar tissue or tumor. Depending on the size, shape and character of the nodule we determine the likelihood of cancer. If we cannot rule the possibility of lung cancer, a larger nodule (or mass) may be biopsied either using a bronchoscope by a lung doctor, or a needle biopsy under CT guidance by a radiologist for diagnosis in the least invasive way although there is a small chance of collapsing the lung.