Parsonage Turner Syndrome is a rare disorder that presents with shoulder pain.
Synonym: idiopathy brachial plexopathy, neuralgic amyotrophy
Clinical features:
(1) abrupt onset of shoulder pain, typically unilateral
(2) progressive motor weakness, dysesthesias, and numbness
(3) pain may be worse at night and awaken the patient from sleep
(4) pain may extend into the trapezius muscle, upper arm, forearm and hand.
(5) pain is usually self-limited and the patient tends to make a favorable functional recovery
The onset may follow some triggering event but there is no direct injury to the brachial plexus (trauma, herniated disk, tumor mass, etc). It may be the result of an immune reaction.
