pulmonary bleb


pulmonary bleb

air-filled alveolar dilation less than 1 cm in diameter on the edge of the lung at the apex of upper lobe or superior segment of lower lobe; usually occurs in young people and can rupture, producing primary pneumothorax. Compare: pulmonary bulla.

pul·mo·nar·y bleb

(pul'mŏ-nār-ē bleb) Air-filled alveolar dilation smaller than 1 cm in diameter on the edge of the lung at the apex of upper lobe or superior segment of lower lobe; usually occurs in young people and can rupture, producing primary pneumothorax.