A solid occupancy of the lung (or a shadow in the lung) is a relatively common diagnosis, which means that a mass in the lung is found on an X-ray chest film or CT, but it is not certain what the mass is. In fact, the vast majority of solid occupancies in the lung are inflammatory pseudotumors, tuberculomas, or lung cancer. If it is an inflammatory pseudotumor, which is the most fortunate case, anti-inflammation is sufficient. If it is a tuberculoma, anti-tuberculosis will also achieve treatment in most patients. However, once the most unfortunate possibility – lung cancer – has occurred, early surgery is its only hope for cure. Unfortunately, the nature of a solid occupancy in the lung is often very difficult to determine, and doctors’ advice is often to “Wait and See”, or to treat it first with anti-inflammatory therapy and then try something else if it doesn’t work. This is because it does not seem worthwhile to open the chest simply for an occupancy of unknown nature. As a result, the patient has to wait and see how the disease progresses and suffer in a mood of being “sentenced”. As a result of such treatment, while some patients escape an operation, others lose the chance to treat lung cancer. The thoracoscopic surgery performed in our department solves this paradox and allows for easy diagnosis and treatment of solid occupations in the lung. If the intraoperative pathology is benign, the patient can be discharged from the hospital in a few days with minimal surgical damage. If unfortunately it is malignant, then radical resection of lung cancer can be performed immediately with a small incision (maximum 6cm) assisted by thoracoscopy, i.e. there is no delay in treatment and the surgical blow is far less than ordinary open-heart surgery. It is the preferred means of treatment for solid occupying lung lesions. The above mentioned methods have become the standard treatment for solid occupying lung lesions in foreign countries.