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scintillating scotoma

(sĭntl-ā′tĭng)
n.
  1. A localized area of blindness that may follow the appearance of brilliantly colored shimmering lights and is associated with the aura of migraine.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.