Fig. 5

Representative images illustrating three different forms of brachial plexus neoplasia. First case of schwannoma presents a neurogenic, inhomogeneous hyperintense nodule on a plain MRN image (A, red rectangle box), while an evident central signal decrease is revealed as “enhanced target sign” on a CE-MRN image (B). Second case of neurofibroma demonstrates a diffuse hypointense mass along nerves on a plain MRN image (C), with moderate inhomogeneous enhancement on a contrast enhanced T1 VIBE image (E). Additionally, regional signal decrease and an abrupt disruption are observe on a a CE-MRN image (D). Third case of neurofibromatosis exhibits multiple masses arranged in a nerve distribution pattern on a plain MRN image (F), while multiple “enhanced target signs” are observed on a CE-MRN image (G, red rectangle box).