Experimental Factor Ontology term EFO_0000768 (idiopathic pulmonary fibrosis) (IPF) is a nonneoplastic pulmonary disease that is characterized by the formation of scar tissue within the lungs in the absence of any known cause. Also known as: CFA, UIP, cryptogenic fibrosing alveolitis, fibrocystic pulmonary dysplasia, idiopathic pulmonary fibrosis, familial, usual interstitial pneumonia.