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A 59-year-old male with neurofibrosarcoma involving the right brachial plexus. Coronal STIR (A) image shows a large heterogeneous, predominantly hyperintense, mass arising from the right brachial plexus (arrows). Focal linear low-signal septae are seen within. Contrast-enhanced, fat-suppressed, axial (B) image shows the mass enhancing intensely; it is dumbell-shaped, with a small intraspinal component that indents the thecal sac, and a large paravertebral component
