pseudocyst
[ sōō′dō-sĭst′ ]
n.
An abnormal sac that resembles a cyst but has no membranous lining.
adventitious cyst false cyst
A cyst whose wall is formed by a host cell and not by a parasite.
A cyst consisting of a host cell enclosing a mass of Toxoplasma parasites, usually found in the brain.