The presence of a blood vessel crossing in a lung nodule is not necessarily a malignant tumor, and pathological testing is needed to determine the nature of the nodule. The presence of a perforated blood vessel in a pulmonary nodule usually means that a blood vessel has passed through the lung nodule, a condition that can nourish the cells surrounding the nodule, with the possibility of a malignant tumor or a benign one. The results of this test do not determine whether a nodule is malignant; the nature of the nodule is determined by performing pathologic testing. The formation of lung nodules may be related to pollution in the patient’s environment, or may be due to pneumonia, tuberculosis, or lung tumors. Patients with lung nodules should avoid smoking and heavily polluted environments. Lung nodules should be timely to the hospital, active diagnosis and treatment, early detection and early treatment, to avoid aggravation of the condition.