PMC4743268_01
Magnetic resonance imaging of the left brachial plexus demonstrating a heterogeneous T1-hyperintense (a), homogeneously enhancing (b) well-circumscribed lesion located in the posterior brachial plexus (white arrows)
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F1
T1-weighted, heterogeneously enhancing, well-circumscribed lesion suggestive of a MPNST [Figure 1]. Two biopsies were nondiagnostic.
PMC4743268_02
Magnetic resonance imaging of the brachial plexus demonstrating a T1-isointense (a), T2-hyperintense (b), avidly enhancing (c and d) soft tissue mass along the left C7/T1 and T1/T2 neuroforamina (white arrows)
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F2
T2 hyperintense, and markedly enhancing soft tissue mass on the T1/gadolinium diethylenetriamine pentaacetic acid study within and beyond the left C7/T1 and T1/T2 neuroforamina. The immediate concern was for a MPNST [Figure 2]. The patient underwent a computed tomography-guided fine-needle aspiration/biopsy of the mass; it demonstrated acute inflammation without tumor cells.