cervical rib syndrome

n.
  1. A syndrome caused by pressure from the cervical rib on the nerves of the brachial plexus and manifested by pain and tingling along the forearm and hand that may develop into anesthesia with cyanosis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.