Figure 14a. (a) Axial contrast-enhanced CT scan shows a small collection of fluid (arrow) in the posterior pericardial recess located below the level of the carina. B = bronchus, RPA = right pulmonary artery. (b, c) Axial contrast-enhanced CT scans obtained inferior to a demonstrate the continuity between the posterior pericardial recess and the oblique sinus (arrow in c). LA = left atrium.