Acute brachial plexus neuritis is an uncommon disorder characterized by severe shoulder and upper arm pain followed by marked upper arm weakness1.  Brachial neuritis (BN), also known as neuralgic amyotrophy, is a rare syndrome of unknown etiology affecting mainly the lower motor neurons of the brachial plexus and/or individual nerves or nerve branches. BN usually is characterized by the acute onset of excruciating unilateral shoulder pain, followed by flaccid paralysis of shoulder and parascapular muscles several days later. The syndrome can vary greatly in presentation and nerve involvement2.

This syndrome was first described in 1943 by Spillane, but popularised with a larger series in 1948 by Parsonage and Turner.3 Hence Brachial plexus neuritis is also termed as Parsonage – Turner syndrome.

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