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FIG 4. A and B, STIR images of the brachial plexus (A) and nerves entering upper arm (B). The components of the brachial plexus (arrows in A) have a higher signal intensity than that of skeletal muscle, whereas nerves in the upper arm (arrows in B), emerging from the brachial plexus and nearly parallel to B0, are isointense or slightly hyperintense to muscle.
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