Figure 15: A 23-year-old female with perineural lymphomatosis. A, Coronal fat-suppressed T2-weighted MR image shows asymmetric thickening, hyperintensity and enhancement (not shown) along the BP (arrows). Note the clumping of plexus elements on the right side with loss of internal architecture. B, Axial fat-suppressed T2-weighted MR image shows high signal intensity in the sternocleidomastoid (open arrow), scalene and paraspinous muscles (white arrow) on the right side and adjacent soft tissue of the neck.