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Figure 13. (a, b) Non-enhanced and enhanced CT scans in a 52-year-old woman showing normal superior pericardial recesses seen as small, non-enhanced near-water density structures (arrows) posterior to the ascending aorta (AA) and in the groove between the ascending aorta and pulmonary artery (P). The typical location and CT appearance allow pericardial recesses to be distinguished from mediastinal lymphadenopathy. Note a normal right lower paratracheal node containing a fat hilum (arrowhead). DA = descending aorta.
