Most lung cancer patients are diagnosed through bronchoscopy and CT-guided puncture, which means that a tissue about the size of a grain of rice is taken and carefully observed by pathologists under a microscope. The most common sites of lung cancer spread are brain, bone, liver and adrenal gland, so brain MRI, bone scan, ultrasound or enhanced CT of liver and adrenal gland should be done, which are all very important for treatment plan formulation.