Nodules in the lungs that have increased in size by 1mm in 1 year are in most cases not serious diseases, as the relative changes are not particularly noticeable with a rate of increase of 1mm in 1 year. The more common is the lung benign occupational lesions, such as the most common teratoma, misshapen tumors, etc., this type of benign tumor changes are year for unit, such as 1 year or two years, can appear to have a slight increase, for example, 1 year 1mm, which is not a serious disease, through the surgical resection can be completely cured. Clinically, X-ray, CT or MRI of both lungs are taken to observe the changes of lung nodules for follow-up.