Defense Trade Cooperation Treaties & Resources. This page provides information intended to assist in using the Defense Trade Cooperation Treaties the U.S. has signed with the United Kingdom and Australia. The information provided here supports the users of the exemptions to the International Traffic in Arms Regulations (ITAR) created pursuant to the Treaties.
Definition of Lung Nodules. A lung nodule is defined as a âspotâ on the lung that is three centimeters (about 1.5 inches) in diameter or less. If an abnormality is seen on an x-ray of the lungs that is larger than three centimeters, it is considered a âlung massâ instead of a nodule and is more likely to be cancerous.
A. A lung nodule is a small, solid abnormality in the lung. Nodules are most commonly detected on a chest X-ray or CT scan. There are many causes of nodules. Depending on the cause, a nodule may have no importance or it may represent a serious disease. Some of the most common causes of lung nodules include: 1  Scar tissue. lung nodule is a small, solid abnormality in the lung. Nodules are most commonly detected on a chest X-ray or CT scan. There are many causes of nodules.