Abstract
Acute interstitial pneumonia is clinically characterized by an interstitial lung disease causing rapid onset of respiratory failure, which is different from other more chronic forms of interstitial pneumonia. It is synonymous with Hamman-Rich syndrome, occurring in patients without pre-existing lung disease. Histopathological finding is diffuse alveolar damage. Acute interstitial pneumonia radiologically and physiologically resembles acute respiratory distress syndrome and is considered to represent a part of idiopathic acute respiratory distress syndrome. It is frequently confused with other clinical entities characterized by rapidly progressive interstitial pneumonia, especially secondary acute interstitial pneumonia, acute exacerbation and accelerated forms of crytogenic fibrosing alveolitis. This review aims to clarify the relative clinical and pathological issues. Key words: Acute interstitial pneumonia; Diffuse alveolar damage; Idiopathic acute respiratory distress syndrome
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