Localized Interlobar Effusion in Congestive Heart Failure

Abstract
Four illustrative cases of localized interlobar effusion as a manifestation of congestive heart failure are presented. The right transverse fissure was most often involved. The x-ray shadow was dense and variable in shape, frequently resembling a tumor mass, and consequently presented a diagnostic problem. Diagnosis was confirmed by demonstrating the disappearance of the "tumor" following diuresis and restoration of cardiac compensation. The disorder is apparently not rare.