An 8.6 x 6.6 mm solid nodule was seen at the outer base of the lower lobe of the right lung, and the nature of the solid nodule was first assessed to determine its severity. The presence of a solid nodule in the lung makes it clear that it is at the outer base of the lower lobe, but it is necessary to assess the size of the nodule, the nature of the nodule, whether the border is clear, whether the internal echoes are regular, whether there is a blood supply, and whether there are signs of malignant changes, such as pleural pulling, and it is not possible to determine the nature of the nodule simply by virtue of its location and size. If there are unclear borders, burr or lobular changes, irregular internal echoes, blood supply or pleural pulling and other malignant signs, percutaneous lung aspiration cytology can be performed, and if necessary, surgical resection can be performed to determine the nature of the lung nodule. If a nodule larger than 0.8 cm is found at the base of the right lower lobe of the lung, and if it is initially recognized as benign, regular follow-up is still needed. It is recommended to consult the Department of Thoracic Surgery of a regular hospital for definitive diagnosis and standardized treatment.