Fig. 2. ( A ) T2 coronal image demonstrating increased signal intensity of the right brachial plexus ( arrow ). ( B ) Sagittal T1 image demonstrating swelling of the brachial plexus ( arrows ) posterior and superior to the subclavian artery flow void. ( C ) Sagittal T2 image demonstrating increased girth and increased signal of the brachial plexus ( arrow ) posterior and superior to the subclavian artery flow void.