Mayo-Robson's position

[-rōbsənz]
n.
  1. A supine position with a thick pad under the loins to elevate the lumbocostal region, used in operations on the gallbladder.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.