CT cannot confirm the diagnosis of lung cancer. CT can only detect occupying disease in the lung through examination. Such occupying lesions with irregular morphology, short burrs at the edges and signals of blood flow around them are more likely to be considered lung cancer. To confirm the diagnosis, a puncture biopsy or direct surgical excision of the soft tissue mass or ground glass-like nodule found by CT is needed to clarify whether it is lung cancer or exactly what kind of nature of lung cancer it is. Genetic testing can also be done on the puncture specimen or post-surgical specimen to find out if there is a driver mutation, and if there is a driver mutation, treatment options such as targeted drugs or immune checkpoint inhibitors can be used. Therefore, CT can only detect lung occupancy, but the diagnosis of lung cancer depends on pathological examination.