Medical Definition of Horner syndrome

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Reviewed on 12/12/2018

Horner syndrome: A condition resulting from interruption of the sympathetic nerve pathways to the eye, resulting in the drooping of the upper eyelid on one same side (ptosis), the constriction of the pupil of that eye (miosis), and with the lack of sweating (anhidosis) and flushing of the affected side of the face. Also known as Horner-Bernard syndrome, Bernard syndrome, Bernard-Horner syndrome, and Horner ptosis.

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Reviewed on 12/12/2018