How to distinguish small pulmonary nodules from large pulmonary nodules?

In medicine, "nodule" is a description of morphology. Usually, a lesion whose lung looks like a circle and its diameter is less than 30 mm is called a "nodule". According to the density of nodules on CT images, nodules can be divided into solid nodules and sub-solid nodules, and sub-solid nodules can be divided into partial solid nodules and ground glass density nodules. Simply put, solid nodules refer to lesions that look similar to the density of human soft tissue; Ground glass density nodule refers to the fuzzy translucent nodule shadow in the lung; Some solid nodules refer to lesions with both fuzzy parts and high density parts. Lesions with a diameter greater than or equal to 10 mm are called large nodules. The etiology of large pulmonary nodules is basically similar to that of small pulmonary nodules, but in terms of risk and attention, large pulmonary nodules are generally higher than small pulmonary nodules. Some need to decide whether to intervene according to the morphological characteristics of nodules and whether the patient has symptoms or not. Lesions with a diameter less than 10 mm are called small nodules. At present, the improvement of the detection rate of pulmonary nodules is actually related to the popularization of CT examination. According to statistics, 10 of every 500 people were found to have pulmonary nodules, and about 90% of them had no clinical manifestations.