Pulmonary segregation is a form of pulmonary cystic disease with an abnormal arterial blood supply, which is a congenital malformation of lung development. It can be divided into intrapulmonary type, which can often be co-infected, and extrapulmonary type, which can also increase in size to produce compression or have a small chance to connect with the gastrointestinal tract, etc. Therefore, surgery is recommended for the former, and surgery is recommended for the latter with symptoms, or if the diagnosis is unclear. Surgery is mainly to prevent damage to the abnormal vessels from the aorta that can lead to hemorrhage. Mechanized pneumonia is formed after the pneumonia does not dissipate and there is a large amount of fibrous tissue proliferation at the same time. It is often difficult to reverse and may transform into an inflammatory pseudotumor. Surgery is also recommended for confined lesions where antibiotic therapy is ineffective.