Designed to be a practical aid to the physician faced with making a difficult diagnoses in their own clinical setting. It opens with an introductory section covering general considerations-patient evaluation, including history and clinical signs, investigations, DLD classification according to the current guidelines, and therapeutic options. This is followed by a section devoted to specific DLDs including sarcoidosis, idiopathic pulmonary fibrosis, occupational and iatrogenic DLDs, and other less common disorders. Coverage concludes with a section of case histories to illustrate differing approaches to diagnosis and management, a feature unique to this text and emphasizing its clinical applicability.