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.
Pulmonary nodules are common and most are benign or noncancerous. Nodules are found on up to half of all lung CT scans. When a pulmonary nodule is cancerous, the spot or growth is usually larger than 3 cm or has other characteristics like an irregular shape. Pulmonary nodules donât cause symptoms. You may have a nodule on your lungs for years and never know it. If a spot on your lungs is cancerous, you may have symptoms related to the specific type of cancer. For example, growths caused by lung cancer may cause a persistent cough or breathing difficulties.