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Horner's syndrome - Definition


Horner's syndrome is caused by an attack on the sympathetic nervous system. It manifests as four precise clinical signs: drooping of the upper eyelid, or ptosis; constriction of the pupil, or miosis; the eye being sunk into the socket, or enophthalmos; and dilation of the blood vessels along with decreased sweating around the neck and face, called anhidrosis. Horner's syndrome is secondary to a damaged sympathetic nerve in the neck. It is commonly caused by lesions on the central nervous system, such as in certain forms of stroke, or by the compression of this nerve by different processes.