Dictionary of Cancer Terms
View in Spanish: Síndrome de Horner
Horner syndrome (SIN-drome)
A condition in which one side of the face is flushed, does not produce sweat, and has a constricted pupil and drooping eyelid. It can be caused by an injury to, or paralysis of, nerves in the neck, or by a tumor.
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.