Microscopic thyroid cancer, a problem that has to be taken seriously Recently, 20 cases of thyroid nodules less than 0.8 cm (or even less than 0.5 cm) in diameter were removed, of which about 60.0% (12/20) were papillary thyroid cancer; of course, such a high incidence is a coincidence, and, the surgery was selective, that is, ultrasound examination showed: nodules with unclear borders, incomplete envelope, density uneven (with calcification), etc. However, it also shows that even small thyroid nodules should not be paralyzed. Clinically, thyroid cancer smaller than 1 cm is called microscopic thyroid cancer. Because the nodules are small, patients usually do not feel them and most doctors cannot feel them by palpation, so they are mostly found during physical examination. However, we found that about 5% of microscopic thyroid cancer has metastasized to lymph nodes, mainly in the area of trachea and esophageal groove. Once metastasis is present, the prognosis will be affected. Therefore, “small” thyroid nodules should not be ignored. Summarizing these cases, we found that there are certain commonalities. The preoperative ultrasound showed unclear borders, incomplete envelope, calcification and uneven calcification (punctate, sandy).