In a lung transplant procedure, the sick lung is taken out and replaced with a healthy lung from someone else. If one lung is damaged then the lung transplants will be of one type and that is you only need to change one lung but if both lungs are damaged then the lung transplants will be of another type where you require changing both lungs. Damage to the lungs is a major concern. Oth... https://www.edhacare.com/treatments/organ-transplant/lung