Diffuse Interstitial Pulmonary Disease from the Perspective of the ClinicianDiffuse interstitial pulmonary disease encompasses a large number of entities having in common the diffuse infiltration of alveolar walls by inflammatory or malignant cells, connective tissue, or fluid that impairs the transfer of oxygen to the blood. In recent years, there has been heightened interest in this area of pulmonary disease, with a number of reviews having been published. To a large degree, this has resulted from the introduction of bronchoalveolar lavage, allowing studies of the humoral and cellular events involved in pathogenesis. Most reviews of diffuse interstitial pulmonary disease have emphasized pathogenic mechanisms and pathologic findings as their thrust. (more…)