肺间质纤维化的原因之一是结节病。除了增多肺纹理，胸片还可见明显的肺门淋巴结病(非干酪性肉芽肿性炎症)。
One cause for pulmonary intersitital fibrosis is sarcoidosis. In addition to increased interstitial markings, the chest radiograph may display prominent hilar lymphadenopathy (from non-caseating granulomatous inflammation) as shown here.
