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

/pseu·do·cyst/ (soo´do-sist)
1. an abnormal or dilated space resembling a cyst but not lined with epithelium.
2. a complication of acute pancreatitis, characterized by a cystic collection of fluid and necrotic debris whose walls are formed by the pancreas and surrounding organs.
3. a cluster of small, comma-shaped forms of Toxoplasma gondii found particularly in muscle and brain tissue in toxoplasmosis.

pseudocyst

[so̅o̅′dəsist]
Etymology: Gk, pseudes + kystis, bag
a space or cavity containing gas or liquid but without a lining membrane. Pseudocysts commonly occur after pancreatitis when digestive juices break through the normal ducts of the pancreas and collect in spaces lined by fibroblasts and surfaces of adjacent organs. Symptoms are caused by displacement of abdominal structures or fluid or by atelectasis at the base of the left lung. Ultrasound and computed tomography are useful in diagnosis; surgical drainage is the best therapy. Also called adventitious cyst, false cyst. See also pancreatitis.

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]

pseudocyst

an abnormal dilated space resembling a cyst but not lined with epithelium, e.g. a retroperitoneal accumulation of urine from a leaking ureter.

pancreatic pseudocyst
accumulation of pancreatic secretions and cellular debris may occur with recurring episodes of pancreatitis, most commonly in dogs.
perirenal pseudocyst, perinephritic pseudocyst
see feline perirenal cysts.
salivary pseudocyst
see salivary mucocele.
References in periodicals archive ?
Adrenal cysts: simple cysts, pseudocysts, lymphangiomas
Acute pancreatitis leads to peripancreatic inflammation, the serous exudates get collected and form a pancreatic pseudocyst.
5) In addition to micrencephaly, frequent findings in the brains of fetuses affected by TORCH agents include ventriculomegaly, encephalomalacic pseudocysts, atrophic corpus callosum, polymicrogyria, cerebellar hypoplasia, and calcifications, which can usually be detected by neuroimaging.
CT scans were retrospectively reviewed on picture archiving and communication systems (PACS) workstations and findings were recorded; including presence and extent of pancreatic necrosis, fluid collections, pseudocysts and the presence of extrapancreatic findings such as VCs (venous thrombosis and pseudoaneurysm), gall bladder, common bile duct (CBD) and colonic involvement.
Morphological local complications of this type of severe AP include acute peripancreatic fluid collection and pancreatic pseudocyst.
Berovalis, "A rare case of pancreatic pseudocyst masquerading as hydrocele," Acta Gastro-Enterologica Belgica, vol.
In cats, T foetus is considered trichomonads with no existing cyst form; nevertheless, formation of pseudocysts or of true cysts has been already observed in several trichomonads, probably as a response to environmental stress [18].
Herlyn–Werner syndrome in their original description is a unilateral renal aplasia, with double uterus and blind vagina presenting as Gartner's pseudocyst.
After his release in October, Kai has struggled with a pseudocyst - a collection of fluid in the stomach - and found himself in hospital again on Boxing Day.
A low amylase concentration helps to exclude pancreatic pseudocysts (98% specificity for pancreatic non-pseudocyst lesions <250IU/L) (3).
According to this new classification, complications of the disease can be systemic or local; the latter are described in detail, taking into consideration CT findings, differently from the previous classification, and are classified into peripancreatic fluid collections, pancreatic and peripancreatic necrosis (sterile or infected), pseudocyst and walled-off necrosis.
111 This induces a combination of fat necrosis, collagen degeneration, myxoid changes and sometimes pseudocyst formation.