Brachial plexitis
Brachial plexitis is an inflammation of the brachial
plexus. This is a rare, poorly understood condition.
After the nerve roots leave the cervical spine they
combine to form the brachial plexus (a network of nerves).
This plexus can become inflamed and cause arm pain.
Usually the pain is severe but only lasts for several
days, after which the arm becomes weak in multiple different
muscles. The weakness may be profound, but will usually
get better with time.
Imaging studies of the cervical spine will usually
be negative, and if there is any question that the pain
is from a pinched nerve root or a brachial plexus inflammation,
an EMG study can help differentiate the two conditions
Treatment typically includes oral steroids, rest, and
patience.
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