A nodular density shadow actually means that there is a nodule in the lung. If the nodule is less than 5mm, it is usually benign. If the nodule is more than 5mm and has a poor morphology, it is more likely to be malignant. 1. Benign nodule: If the size of the lung nodule is less than 5mm, and the edge is smooth and without burrs, and there is no blood vessel, it is generally a benign nodule. If there is no physical discomfort, regular follow-up is usually all that is needed. 2. Malignant nodule: If the size of the lung nodule is larger than 5mm, and the edge is irregular, with burrs, lobes, pleural pulling signs, and abundant blood vessels, it is generally a malignant nodule, and the patient should undergo biopsy in time. And treated by minimally invasive surgery or chemotherapy and other methods. If the patient has the situation of lung nodule density shadow, he should carry out the relevant examination of lung nodule in time, clarify the nature, and then carry out the treatment under the guidance of the doctor.