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Horner syndrome

Pronunciation: hor'ner

Definition: ipsilateral myosis, ptosis, and facial anhydrosis; usually unilateral and due to an ipsilateral lesion of the cervical sympathetic chain or its central pathway; an ominous sign when it accompanies an ipsilateral traumatic brachial plexopathy because it usually indicates an avulsion of the C8 and T1 primary roots from the spinal cord.

Synonym(s): Bernard-Horner syndrome, ptosis sympathetica

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.