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vertebrocostal trigone

n.
  1. A triangular area in the diaphragm near the lateral arcuate ligament, devoid of muscle fibers, and covered by pleura above and by peritoneum below.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.