Fig 14. A, Nodal metastases from breast cancer (short white arrow) are seen to infiltrate the anterior scalene muscle (a) and the hypodense brachial plexus (long white arrow) on this enhanced axial CT image. A tongue of nodal disease indents the plexus beyond the anterior scalene muscle.

B, This same nodal mass (N) infiltrates the anterior mediastinum and abuts on the supraortic vessels in the left.