Nodular hyperdense shadow in the right lower lung needs to be combined with clinical data to determine its benign or malignant nature; benign can be followed up and observed, while malignant nodules are considered to require surgical resection. Nodular hyperdense shadow in the right lower lung, i.e. lung nodule, is a mass found in chest imaging examination, and its density is generally higher than that of lung tissue. Lung nodules can be categorized into benign and malignant nodules according to their nature. Benign nodules generally have a better prognosis and do not require special treatment, regular follow-up observation is sufficient. Malignant nodules, i.e. lung cancer, need to be treated actively with surgery or radiotherapy according to the condition. Benign nodules can be seen in inflammatory lung nodules, tuberculosis ball, fibroma, etc. They usually have uniform density, slow growth rate and clear margins. Malignant nodules generally have uneven density, pleural pulling, nodules may appear burrs, bronchial or vascular shadows, internal lobulation, etc. The nature of the nodule can be pre-determined based on the imaging characteristics of the nodule. The appearance of lung nodules, it is recommended to seek timely medical attention, to clarify the nature, under the guidance of professional doctors, reasonable and standardized treatment.