Mild bibasilar atelectasis is a partial collapse of both lungs caused by the deflation of the alveoli in the lower part of the lungs, according to the National Heart, Lung, and Blood Institute. Several things can cause it, including a partially obstructed airway or complications from surgery.
Most cases of mild bibasilar atelectasis are not serious and eventually go away without treatment. There may be no symptoms present at all or mild shortness of breath. Forced coughing, deep-breathing exercises and gentle exercise can help the alveoli to re-inflate and alleviate the condition, reports Medical Treasures. If the condition worsens, it may be indicative of a more severe underlying cause and requires medical attention.