This is the second in the series of fascicles on Non-Neoplastic Diseases and because of its multidisciplinary nature includes two radiologists and a pulmonologist as co-authors. The advent of high-resolution computed tomography has transformed the field of interstitial lung disease and its inclusion in this volume provides many radiologic images to complement pathologic images. Contents: Embryology and Anatomy * Handling and Analysis of Bronchoalveolar Lavage and Lung Biopsy Specimens with Approach to Patterns of Lung Injury * Idiopathic Interstitial Pneumonia and Other Diffuse Parenchymal Lung Diseases * Pulmonary Vasculitis * Reactive Lymphoid Lesions * Connective Tissue and Inflammatory Bowel Diseases * Drug and Radiation Reactions * Bronchiolar Disorders * Bronchial Disorders * Obstructive Pulmonary Diseases * Congenital Anomalies and pediatric Disorders * Lung Infections * Interpretation of Lung Biopsies from Immunocompromised Patients and Patients with Acquired Immunodeficiency Syndrome * Transplantation Pathology * Pulmonary Hypertension and Other Vascular Disorders * Occupational Lung Diseases and Pneumoconioses * Miscellaneous Diseases of Uncertain Etiology * Pleural Disorders