"post-pneumonic pneumatocele: a thin walled pneumatocele is not really a cavity, but when infected, can be thick-walled"
"Pseudocavities are areas of spared parenchyma, normal/ectatic bronchi or emphysema that appear as areas of low attenuation in nodules, masses or consolidation, thereby mimicking cavitation 12. Since emphysema lacks walls, it should not be considered a cavity. However, emphysema can be infected and shows an air-fluid level 14. Cystic bronchiectasis is due to dilated bronchus, causing saccular outpouchings around the hilum and paramediastinum, causing a "cluster of grapes" appearance 14. Honeycombing is due to the destruction of lung parenchyma, with retraction by fibrotic walls, measuring 3 to 10 mm in diameter, arranged in layers along the subpleural space, and thus is not considered a cavity 14."
"A cavitary lesion may contain gas, fluid or both, in which case there will be a gas-fluid level. A cavity can form within a pre-existing lesion (nodule, mass, or consolidation)."
"Cavity content could consists of air, liquid or solid. Liquid component could be due to blood, pus, secretions or liquefied necrosis. Solid comoonent could be due to blood clot, tumour, fungus, pus or sequestrum 14."
"Cavity content could consists of air, liquid or solid. Liquid component could be due to blood, pus, secretions or liquefied necrosis. Solid comoonent could be due to blood clot, tumour, fungus, pus or sequestrum 14."
"Cavity content could consists of air, liquid or solid. Liquid component could be due to blood, pus, secretions or liquefied necrosis. Solid comoonent could be due to blood clot, tumour, fungus, pus or sequestrum 14."