CLINICAL OBSERVATIONS AND INTERPRETATIONS OF ABNORMAL AIR SPACES IN THE LUNGS

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Abstract
Abnormal air spaces in the lung parenchyma, such as cysts, bullae, and pneumatoceles, have been the subject of an increasing amount of discussion during the past 25 years. Large-scale roentgenographic surveys have revealed many such cases in which the lesions were clinically latent. Long-range observations have revealed their variable clinical evolution, and increasing numbers of surgical explorations have yielded data on their morphological features. All of this has thrown much new light on these remarkable pulmonary changes. In view of all the accrued information there is now renewed discussion of cystic, bronchiectatic, and bullous lung changes. In recent literature there is increasing cognizance of the fact that these changes are related to each other and, in some manner, to emphysema, the essential basis of which is air space abnormality. Brief reading of current writings should convince us that there is now an urgent need for a better understanding of the

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