Fig. 7

Plexiform neurofibroma. a Axial T1-weighted MR image demonstrates a mass that is iso−/hypointense to muscle (arrows). b Axial T2-weighted MR image demonstrates numerous hyperintense masses involving the left carotid space (white arrows). The left internal carotid artery (i) is displaced posterolaterally. Note the characteristic “fish-eye” or “target” appearance of this lesion (black arrows). This patient had neurofibromatosis, and extensive trans-spatial neurofibromas can be seen in other portions of the neck (arrowheads)