Figure 3. A 65-year-old man with chronic lymphocytic leukaemia. (a) Enhanced CT scan demonstrates enlarged right axillary nodes (arrowheads) and right interpectoral (Rotter) node (black arrow) lying between pectoralis major (M) and minor (m) muscles. Nodes in the subpectoral and interpectoral regions are included in the axillary nodal group. Also seen are enlarged highest mediastinal nodes (station 1; white arrows) defined by their location cranial to the superior margin of the left brachiocephalic vein, behind and to the right and left sides of the trachea. (b) Enhanced CT scan at the lower level shows bilaterally enlarged axillary nodes (arrowheads), including left subpectoral nodes (open arrow) underneath the left pectoralis minor muscle (m). There are enlarged pre-vascular nodes (station 3A; white arrows), which lie between the superior margin of the left brachiocephalic vein (V) and the superior margin of the aortic arch, and anterior to its large arterial branches; enlarged retrotracheal node (station 3P; black arrow), which lies behind the trachea and above the inferior aspect of azygos vein arch; and enlarged right upper paratracheal nodes (station 2R; wavy arrow), which are located above the superior margin of the aortic arch.