Dennis Bourdette, M.D., the senior author of the study and director of the OHSU Multiple Sclerosis Center, said the misdiagnoses not only meant patients were getting expensive and potentially harmful treatments they didn't need, but they were also not getting the appropriate treatment for the diseases they may have had.

"These patients were getting the wrong treatment — and missing out on the correct treatment," Bourdette said.

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http://www.ohsu.edu/xd/about/news_events/news/2012/05-09-ohsu-study-misdiagnosis.cfm