ventriculomastoidostomy

[vĕn-trĭk′yə-lō-măs′toi-dŏstə-mē]
n.
  1. A surgical procedure used in treating hydrocephalus in which a communication is established between the lateral cerebral ventricle and the mastoid antrum.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.