Lung tumors with a diameter of 7 cm are unlikely to be considered benign, but they still need to be judged in conjunction with the imaging characteristics of the tumor and clinical data. Benign lung tumors are generally small in diameter and grow slowly or maintain the same diameter for a long period of time, which can be seen in lung abscess after mechanization, tuberculosis ball, fungal pneumonia foci, inflammatory pseudotumor of the lungs, and lung misshapen tumors. Tumor diameter is only one aspect of evaluating benign and malignant tumors, malignant tumors of the lungs also have the characteristics of uneven nodule density, fast short-term multiplication, irregular edges, and lobulation within the nodule, etc. When the lung tumor reaches 7cm, it is often accompanied by more obvious clinical symptoms. Although 7cm lung tumors are less likely to be benign, there is still a certain possibility that they are benign, so it is recommended to follow the guidance of professional doctors and perform biopsy and puncture to make a clear diagnosis if necessary.