Pneumoniareferstoaninflammationinthelungs,whileinterstitialpneumoniareferstoaformofpneumoniainwhichtheinflammationoccursinthewallsofthealveoli(theaircellsofthelungs),orintheinterstitium(thespacesbetweenthetissuecellsofthealveoli).
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Pneumonia refers to an inflammation in the lungs, while interstitial pneumonia refers to a form of pneumonia in which the inflammation occurs in the walls of the alveoli (the air cells of the lungs), or in the interstitium (the spaces between the tissue cells of the alveoli).