"The pulmonary interstitium is a collection of support tissues within the lung, including the alveolar epithelium, pulmonary capillary endothelium, basement membrane, perivascular, and perilymphatic tissues 1,2. Although one continuous space, the pulmonary interstitium can be divided into three zones 1-4:"
"interlobular: lymphangitis carcinomatosis, pulmonary sarcoidosis, silicosis, hypersensitivity pneumonitis, neurofibromatosis, drug-induced lung disease, pulmonary vasculitis"
"intralobular (parenchymal/septal) interstitum: within the secondary pulmonary lobule; supports the alveolar wall"