Intrafissural fat: CT correlation with chest radiography.

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Abstract
A small collection of supradiaphragmatic fat is occasionally present invaginating into the inferior aspect of the major interlobar fissure. In a review of 212 computed tomography (CT) scans obtained in the immediate supradiaphragmatic region, 39 cases demonstrated some degree of this intrafissural fat collection either unilaterally or bilaterally. On lateral chest radiographs, the intrafissural fat corresponded to a sharply marginated triangular density, the base of which abutted the anterior diaphragmatic surface and the apex of which tapered into the major fissure. The triangular density seen on the chest radiographs was superimposed over the heart and cardiac fat pad but was always easy to distinguish from these owing to the continuity of the density with the oblique fissure.

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