pseudocyst


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pseudocyst

 [soo´do-sist]
1. an abnormal or dilated cavity resembling a true cyst but not lined with epithelium; called also adventitious or false cyst.
2. a cystic collection of fluid and necrotic debris whose walls are formed by the pancreas and other surrounding organs. It occurs as a complication of acute pancreatitis and may subside spontaneously or become secondarily infected and develop into an abscess.
3. a cluster of small comma-shaped forms of Toxoplasma gondii, sometimes containing thousands of organisms within an irregular wall; it represents a resting stage, as opposed to the active, motile stage. Pseudocysts are found in the tissues, especially muscles and the brain, in chronic (latent) toxoplasmosis.

pseu·do·cyst

(sū'dō-sist),
1. An accumulation of fluid in a cystlike loculus, but without an epithelial or other membranous lining.
See also: bradyzoite. Synonym(s): adventitious cyst, false cyst
2. A cyst the wall of which is formed by a host cell and not by a parasite.
See also: bradyzoite.
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 also: bradyzoite.
[pseudo- + G. kystis, bladder]

pseudocyst

Parasitology A cyst-like 'mass' that corresponds to a macrophage laden with Toxoplasma gondii or other sporozoans which is most often seen in the brain, a finding typical of AIDS neuropathy Pathology A dilated space lined by neither epithelium nor mesothelium, classically seen in the pancreas as unilocular spaces lined by fibrous tissue, often following multiple bouts of acute pancreatitis, or in the ultrarare hereditary pancreatitis.

pseu·do·cyst

(sū'dō-sist)
1. An accumulation of fluid in a cystlike loculus, but without an epithelial or other membranous lining.
Synonym(s): adventitious cyst.
2. A cyst with a wall 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; a true cyst enclosed in its own membrane within the host cell that may rupture to release particles that form new cysts.
[pseudo- + G. kystis, bladder]
References in periodicals archive ?
Site of stent migration was CBD in 39(76.4%) patients, pancreas 9 (17.6%) and pancreatic pseudocyst 3(5.8%).
Abdominal pseudocyst as a complication of ventriculoperitoneal shunt placement: Review of the literature and a proposed algorithm for treatment using 4 illustrative cases.
Management strategies for pancreatic pseudocysts. Cochrane Database Syst Rev 2016;2016(4):CD011392.
The disappearing abdominal mass: mesenteric pseudocyst. JSLS 2014;18:319-22.
In addition, a focus compatible with myelolipoma was observed in a limited area, and the diagnosis was interpreted as an adrenal hemorrhagic pseudocyst and concomitant myelolipoma.
Regarding local complications, the APFC was observed in 13 (39.4%) patients, acute necrotic collection was observed in 1 (3%) patient, walled-off necrosis was observed in 1 (3%) patient, and pancreatic pseudocyst was identified in no patient.
An amylase level greater than 479 U/mL is diagnostic of a pseudocyst with better than 90% specificity (28 of 30), (28) whereas a level of less than 250 U/mL excludes a pseudocyst with 98% specificity (42 of 43).
Treatment choices are either pseudocyst resection or nephrectomy, if there is no bilateral disease (Rishniw et al., 1998; Ochoa et al., 1999; Essman et al., 2000).
Tumor-related pancreatitis can occur by ductal obstruction due to PDA, which may result in pseudocyst formation.
In the setting of confirmed or suspected pancreatic infection (infected pseudocyst or necrosis), prompt use of regimens known to penetrate pancreatic necrosis are recommended (quinolones and metronidazole, or carbapenems).