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Horner’s Syndrome can occur from an avulsion of the brachial plexus at the C8-T1 level. It is a pre-ganglionic injury creating disruption of the sympathetic chain with a poor prognosis.
Horner’s syndrome is a combination of symptoms including ptosis (drooping of the upper eyelid), miosis (constriction of the pupil), anhidrosis (loss of facial sweating on the side with the lesion), and enophthalmos.
Other manifestations of pre-ganglionic injury:
Winging of the scapular from serratus anterior paralysis (long thoracic nerve) and rhomboid paralysis (dorsal scapular nerve) may occur as well as flair arm and a positive histamine test.
