Is a scar in the lungs cancer or tuberculosis?

Scar: Cancer grows while a scar stays stable or contracts. Old scars may be from old pneumonia, old tb, old thromboembolic disease, or (especially here in kansas city) histoplasmosis.

See below: A scar is usually nothing to worry about. However, cancers can form in scars - actually just saw a patient with this yesterday. TB can cause scars as well as other things. It would be best to discuss your findings with your physician who knows your history.

Consult: I would consult with a thoracic surgeon. Scars in the lungs can occur after a previous infection. As long as they remain stable in size, usually they are left alone. You doctor may request you to get additional imaging in the future to follow this lesion.