What is the role of pharmacologic testing in the diagnosis of Horner syndrome?

Updated: May 01, 2019
  • Author: Christopher M Bardorf, MD, MS; Chief Editor: Edsel Ing, MD, MPH, FRCSC  more...
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Pharmacologic testing is very helpful in the diagnosis of Horner syndrome. [22] The following pharmacologic tests document the presence or absence of an ocular sympathetic lesion and identify the level of involvement (ie, preganglionic or postganglionic). Localizing the lesion is important because preganglionic lesions are associated with a higher incidence of malignancy that necessitates extensive investigations.

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