Surgical nodules are not as large as CT ones and are a normal occurrence. CT evaluation of nodules, such as lung nodules, thyroid nodules or breast nodules is mainly a kind of examination under CT imaging, and each staff member’s judging standard is different, and also different instruments may have an error of 1~2 millimeters. In addition, the different angles of measurement and the different states of the nodules when they are in the body after surgery can also lead to certain errors, which are all relatively common in the clinic. The margins of surgically excised nodules are often reduced compared to those measured in CT due to dryness and other reasons. There is some measurement difference between the imaging test and the actual surgically excised nodule, or the pathologic biopsy after the actual surgery is the main diagnostic criterion. However, the two are basically in the same class, although there may be differences in the data.