Basic and clinical aspects are discussed by expert contributors in this book devoted to stimulating further studies and developing new therapies for pulmonary fibrosis. Current laboratory and basic findings are reviewed in the book's first 19 chapters, while clinical aspects are addressed in the remaining 16 chapters. These aspects include laboratory and bronchalveolar findings, diagnosis, treatment and prognosis of idiopathic pulmonary fibrosis, collagen disease lungs, sarcoidosis, pneumoconiosis, hypersensitive pneumonia, drug-induced pneumonia, ARDS, radiation pneumonia, BOOP, viral pneumonia, and other diseases causing pulmonary fibrosis. The roles of various cytokines, viral infection, and lung injuries in the development and pathogenesis of pulmonary fibrosis are discussed. The definition, classification, and lung functions of pulmonary fibrosis are included as well.