1. An abnormal sac that resembles a cyst but has no membranous lining.adventitious cyst false cyst
  2. A cyst whose wall is formed by a host cell and not by a parasite.
  3. A cyst consisting of a host cell enclosing a mass of Toxoplasma parasites, usually found in the brain.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.