Figure 8a. Non-Hodgkin lymphoma in a 53-year-old man. Axial (a) and oblique sagittal (b) T1-weighted images show multiple small masses (solid arrows) in the base of the neck and involving the right brachial plexus (arrowheads). Also note the superior mediastinal adenopathy (curved arrow in b). In b, open straight arrow = subclavian artery.