• Eighteen patients who were studied for Horner's syndrome were found to have ipsilateral ptosis and miosis not due to oculosympathetic paralysis. A systematic approach to the diagnosis of Horner's syndrome should include pharmacologic pupillary testing with topically applied cocaine.
Thompson BM, Corbett JJ, Kline LB, Thompson HS. Pseudo-Horner's Syndrome. Arch Neurol. 1982;39(2):108–111. doi:10.1001/archneur.1982.00510140042011
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