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What are lung nodules?

Lung nodules are small masses of tissue in the lung that appear as spots on an X-ray or CT scan of the chest that may or may not be cancer-causing. With the increase in the use of CT scans, lung nodules are being found with increasing regularity, though people with solitary lung nodules do not usually experience symptoms.

Nodules are characterized based upon their size, density and shape. Small and smooth nodules are more likely to be benign, while nodules that are more likely to be cancerous are those with irregular borders, mixed densities or are growing over time.