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pseudocyst

1. An accumulation of fluid in a cystlike loculus, but without an epithelial or other membranous lining.

Synonym: adventitious cyst, false cyst.

2. A cyst whose wall is formed by a host cell and not by a parasite.

3. A mass of 50 or more toxoplasma bradyzoites, found within a host cell, frequently in the brain; formerly called a pseudocyst, but now considered a true cyst enclosed in its own membrane within the host cell that may rupture to release particles that form new cysts, and apparently is infective to another vertebrate host.

See: bradyzoite.

Origin: pseudo-_ G. Kystis, bladder