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Cullen's sign

(kŭlənz)
n.
  1. An indication of intraperitoneal hemorrhage, especially in ruptured ectopic pregnancy, in which blood causes periumbilical darkening of the skin.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.