Figure 2. A 37-year-old woman with sarcoidosis. (a) Enhanced CT scan at level of aortic arch reveals enlarged para-aortic nodes (straight arrows) lying anterior and lateral to the aortic arch at the levels below the superior margin of the aortic arch (A); enlarged right lower paratracheal nodes (open arrows); and enlarged retrotracheal node (wavy arrow). Note mild contrast enhancement of these enlarged lymph nodes. V = left brachiocephalic vein, Oe = oesophagus. (b) Enhanced CT scan at the subcarinal level reveals enlarged bilateral interlobar nodes (open arrows) and subcarinal nodes (closed arrow). As with lymphoma, obstruction of mediastinal or hilar vessels or bronchi is rare, even with marked lymph node enlargement. A = ascending aorta, D = descending aorta.