parenchymal lung disease treatmentpulmonary parenchymal fibrosisdiffuse parenchymal lung diseaseparenchymal lung disease prognosischronic parenchymal lung diseaseparenchymal lesions lungparenchymal changes in lungsparenchymal lung tissueparenchymal scarring lungdiffuse infiltrative lung diseaseparenchymal sarcoidosisparenchymal fibrosis