Lung Biopsy for Diffuse Pulmonary Lesions: Value and Limitations* *From the Division of Pulmonary Medicine and Thoracic Surgical Services, Montefiore and Morrisania City Hospitals. Presented in part at the 16th Annual Postgraduate Course on Recent Advances in the Diagnosis and Treatment of Diseases of the Heart and Lungs, American College of Chest Physicians, New York City, November 14, 1963.