The pathogenesis of right-sided encapsulated pleural effusion is simply that the protein content of the original pleural effusion is relatively high, and during the development of the lesion, these proteins form an envelope that encapsulates the pleural effusion or separates the pleural effusion into many small chambers. The most common disease that can cause encapsulated pleural effusion is tuberculous pleurisy, which is a disease with high protein exudation that can easily form a thick layer of fibrous plates to encapsulate the pleural effusion. Some Staphylococcus aureus infections also exude some purulent proteins to encapsulate the pleural fluid. Chronic immune diseases or cancers that cause pleural effusion may also produce a fibrous membrane of protein in the pleural cavity to wrap the pleural effusion over a long period of time. The easiest way to deal with a pleural effusion is to puncture and drain each separated pleural effusion under the guidance of chest ultrasound. Of course, under local anesthesia, a small opening can be made in the chest wall to break the encapsulated protein bag through some special instruments or fingers, and a thick chest closed drainage tube can be placed to drain the fluid out. If the encapsulated fluid is more severe, open-heart surgery is required to open the chest to clean up the fluid and the encapsulated membrane that has formed.