Limited emphysema of the upper lobe of the left lung is not severe and can be detected on CT. It is most often seen in people who are long-term smokers and also includes restrictive emphysema that develops with age. Long-term exposure to dust, including masons, coal miners, cooks, hairdressers, and tailors, can also present with restrictive emphysema. There are no specific symptoms of restrictive emphysema. If chronic obstructive pulmonary disease develops in people who have been smoking for a long time, there may be signs of decreased lung function such as heart tiredness and shortness of breath after activity. Limited emphysema is detected during physical examination and does not require special treatment. Patients can be advised to quit smoking if they are long-term smokers, and long-term home oxygen therapy is recommended if accompanied by varying degrees of decreased lung function. In conclusion, emphysema in the upper lobe of the left lung is not serious and is a mild CT manifestation.