Chronic interstitial pneumonitis

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Chronic interstitial pneumonitis is a broad descriptive term where an interstitial pneumonia has a prolonged course. It can arise of a range of etiologies. The term does not usually imply a specific radiographic pattern and includes UIP, NSIP or other pattern. As a general rule there is little or no ground glass or confluent consolidation with more reticulation. Some authors place all interstitial pneumonias other than acute interstitial pneumonia into this group.