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dysplastic nevus syndrome

n.
  1. An atypical nevus, usually larger than 5 millimeters in diameter with variable pigmentation and ill-defined borders, marked by melanocytic dysplasia and associated with an increased risk for the development of nonfamilial cutaneous malignant melanoma.dysplastic nevus
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.