Segmentectomy is a surgical procedure that involves removing a specific segment of lung tissue. It is typically performed to treat early-stage lung cancer or other lung diseases while preserving as much healthy lung tissue as possible. This approach can help maintain lung function and reduce recovery time compared to more extensive surgeries. During the procedure, the surgeon makes an incision in the chest and carefully removes the affected segment. Segmentectomy is often considered when the tumor is small and localized, making it a less invasive option than a full lobectomy, which involves removing an entire lobe of the lung.