In a wedge resection, a small wedge-shaped piece of lung containing the tumor is removed. A margin of healthy tissue around the cancer is also removed to help ensure that there is no remaining tumor in the lung. A segmentectomy is the removal of a segment or sub-unit of the lung that is more than a wedge but less than a lobe. Wedge resections can be useful in determining a diagnosis or treating patients with limited lung function.
A wedge is not ideal for patients with better lung function because it leads to a higher rate of recurrence of lung cancer.