Lung nodules grow from 4mm to 7mm in a year with clear borders, but the nodules are growing, so they need to be taken seriously to exclude the possibility of malignant nodules.
Generally speaking, lung nodules smaller than 8mm need to be reviewed regularly to observe the changes in the nodules. When the nodule is found to grow from 4mm to 7mm, it is necessary to be alert to the possibility of early lung cancer. Early stage lung cancer can be completely cured with timely and active treatment, so when you find the nodule growing, you must pay attention to it.
The clear boundary of lung nodule is only one of the bases to judge the nature of nodule, and other judgment methods include the size of nodule, whether there are lobes, burrs, calcified foci, pleural pulling and pleural depression. Therefore, further examination of lung enhancement CT and lung tumor markers are needed to make a clear diagnosis.