vitellointestinal cyst

[vīt′l-ō-ĭn-tĕstə-nəl, vĭt′-]
n.
  1. A small tumor that is at the umbilicus of an infant and is caused by the persistence of a segment of the vitellointestinal duct.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.