Solid nodules at the posterior end of the upper lobe of the right lung are usually considered to be caused by benign lesions such as inflammatory and tuberculosis residual foci and malignant lesions such as lung cancer. 1. Benign lesions: ① may be formed after inhalation of external dust and particles by macrophages; ② may be lung inflammation caused by bacterial, viral and mycoplasma infections; ③ may be caused by tuberculosis foci or scarring of lung tissues due to tuberculosis. 2. Malignant lesions: when CT imaging suggests that some of the solid nodules have: lobular sign, burr sign, vacuolar sign, air bronchial image, tumor trophoblastic artery, vascular incision and collection of pleural depressions or tugging signs, eccentric cavities and other signs, consider that the lung nodules may be malignant lesions. In conclusion, the cause of a partially solid nodular shadow in the posterior segment of the upper lobe of the right lung needs to be diagnosed by a medical professional, and puncture or other ancillary investigations can be performed to clarify the cause of the disease and treat the symptoms.