pseudocyst

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Related to Pseudocysts: ERCP

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 ?
Microscopic chorionic pseudocysts in placental membranes: a histologic lesion of in utero hypoxia.
In order to provide clarity to the patho-physiology of pseudocysts causing jaundice, Sidel et al.
Third, advances in imaging technology may have led to the discovery of more anatomical abnormalities, such as strictures, pseudocysts, or pancreas divisum, that cause the pancreatitis.
Only symptomatic pseudocysts should be treated--in suitable cases, endoscopic treatment is the preferred treatment.
Injuries to the pancreatic duct are treated in a similar fashion, percutaneously draining peripancreatic collections and/or pseudocysts, with the addition of transampullary stents where indicated.
Ultrasonography is primarily used to detect gallstones (sensitivity 60 to 70%) or pseudocysts.
The commonest MRI findings were dilated perivascular spaces; other findings included pseudocysts, parenchymal mass lesions and meningeal enhancement (Figure 4a).
This is true of most dermoid cysts, endometriomas, corpus luteum cysts, hydrosalpinges and peritoneal pseudocysts, and of many paraovarian cysts and benign solid ovarian tumours, for example, fibromas, fibrothecomas, thecofibromas, and thecomas.
Cystic lesions of the pancreas are composed of a broad range of neoplastic cysts and inflammatory pseudocysts.
The anomalies discovered on ultrasound included subependymal pseudocysts, ventriculomegaly, cystic periventricular leukomalacia, periventricular echodensities, hemorrhage, and lenticulostriate vasculopathy.
17] The introduction of infected material into the peritoneal cavity can result in the formation of cysts around the shunt tip or pseudocysts (Fig 2).