coeur en sabot

[kûr ŏn sə-bō, kœr äɴ sä-bō]
n.
  1. A heart that is visible radiographically as having an elevated apex combined with a transverse rectangular enlargement, giving it the appearance of a wooden shoe.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.