Definition of Horner's syndrome
1. Noun. A pattern of symptoms occurring as a result of damage to nerves in the cervical region of the spine (drooping eyelids and constricted pupils and absence of facial sweating).
Medical Definition of Horner's syndrome
A nerve condition which involves a dropping eyelid (ptosis), constricted pupil, enophthalmos and lack of sweating on one side of the face. Often seen in association with injury (for example neck fracture, penetrating injury) to the cervical sympathetic nerve trunk in the neck or a Pancoast tumour involving both the upper and lower brachial plexus.
(29 Sep 1997)
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