Dictionary.com
definitions

marsupialization

[mär-sōō′pē-ə-lĭ-zā′shən]
n.
  1. Surgical alteration of a cyst or similar enclosed cavity by making an incision and suturing the flaps to the adjacent tissue, creating a pouch.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Examples from the Web for marsupialization

Historical Examples of marsupialization