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.
That's because benign lung nodules grow slowly, if at all. On the other hand, cancerous nodules, on average, double in size every four months. Your doctor may continue to a check your lung nodule each year for up to five years to ensure that it is benign. Hamartomas are the most common type of benign lung tumor and the third most common cause of solitary pulmonary nodules. 2  These firm marble-like tumors are made up of tissue from the lung's lining as well as tissue such as fat and cartilage.