CTICasesLamellar Pleural Effusion from Subpleural Interstitial Edema
Imaging findings
Radiograph in a patient with findings of mild interstitial edema, including changes in cardiac chamber size and azygos vein caliber, shows subtle opacity that lies just above rather than at the posterior costophrenic surface, with a possible similar finding on the contralateral side. This is a new finding compared with imaging from a couple of years prior.
Key takeaways
The term lamellar pleural effusion, used in British practice, describes a subtle band of opacity that is not actually pleural fluid but subvisceral (subpleural) interstitial edema. Recognizing it as a manifestation of interstitial edema, distinct from the usual peribronchial cuffing, fissural fluid, and septal lines, prevents misinterpreting it as true pleural fluid.
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