In an adult, atelectasis in a small area of the lung is usually not life threatening. The rest of the lung can make up for the collapsed area, bringing in enough oxygen for the body to function. Large areas of atelectases may be life threatening, especially in a baby or small child, or someone who has another lung disease or illness. The collapsed lung usually reinflates slowly if the blockage of the airway has been removed. However, some scarring or damage may remain.
What to expect if I have Atelectasis  (Outlook/Prognosis)?
In an adult, atelectasis in a small area of the lung is usually not life threatening. The rest of the lung can make up for the collapsed area, bringing in enough oxygen for the body to function. Large areas of atelectases may be life threatening, especially in a baby or small child, or someone who has another lung disease or illness. The collapsed lung usually reinflates slowly if the blockage of the airway has been removed. However, some scarring or damage may remain.