hydatid cyst


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cyst

 [sist]
1. bladder.
2. an abnormal closed epithelium-lined sac in the body that contains a liquid or semisolid substance. Most are harmless, but they should be removed when possible because they occasionally may change into malignant growths, become infected, or obstruct a gland. There are four main types of cysts: retention cysts, exudation cysts, embryonic cysts, and parasitic cysts.
3. a stage in the life cycle of certain parasites, during which they are enveloped in a protective wall.
adventitious cyst pseudocyst (def. 1).
alveolar c's dilatations of pulmonary alveoli, which may fuse by breakdown of their septa to form large air cysts (pneumatoceles).
arachnoid cyst a fluid-filled cyst between the layers of the leptomeninges, lined with arachnoid membrane, usually in the sylvian fissure.
Baker cyst a swelling on the back of the knee, due to escape of synovial fluid that has become enclosed in a sac of membrane.
Bartholin cyst a mucus-filled cyst of a Bartholin gland, usually developing as a consequence of an obstruction of the duct by trauma, infection, epithelial hyperplasia, or congenital atresia or narrowing.
Blessig c's cystic spaces formed at the periphery of the retina.
blue dome cyst
1. a benign retention cyst of the breast that shows a pale blue color. See also cystic disease of breast.
2. a cyst due to endometriosis, found in healed wounds such as those of an episiotomy or an incision for a cesarean section; it is usually found in the vaginal fornix or on the cervix.
Boyer cyst an enlargement of the subhyoid bursa.
branchial cyst (branchiogenic cyst) (branchiogenous cyst) see branchial cyst.
bronchogenic cyst a congenital cyst, usually in the mediastinum or lung, arising from anomalous budding during formation of the tracheobronchial tree, lined with bronchial epithelium that may contain secretory elements.
chocolate cyst one filled with hemosiderin, causing a dark color, following local hemorrhage, such as may occur in the ovary in ovarian endometriosis.
choledochal cyst a congenital cystic dilatation of the common bile duct, which may cause pain in the right upper quadrant, jaundice, fever, or vomiting, or be asymptomatic.
daughter cyst a small parasitic cyst developed from the walls of a larger cyst.
dentigerous cyst an odontogenic cyst surrounding the crown of a tooth, originating after the crown is completely formed.
dermoid cyst see dermoid cyst.
duplication cyst a congenital cystic malformation of the alimentary tract, consisting of a duplication of the segment to which it is adjacent, occurring anywhere from the mouth to the anus but most frequently affecting the ileum and esophagus.
echinococcus cyst hydatid cyst.
embryonic cyst one developing from bits of embryonic tissue that have been overgrown by other tissues, or from developing organs that normally disappear before birth. An example is a branchial cyst.
enteric cyst (enterogenous cyst) a cyst of the intestine arising or developing from some fold or pouch along the intestinal tract. Called also enterocyst and enterocystoma.
epidermal cyst (epidermoid cyst) an intradermal or subcutaneous cyst containing keratinizing squamous epithelium; it arises from occluded hair follicles. Called also wen.
epidermal inclusion cyst a type of epidermal cyst occurring on the head, neck, or trunk, formed by keratinizing squamous epithelium with a granular layer.
epithelial cyst
1. any cyst lined by keratinizing stratified squamous epithelium, found most often in the skin.
exudation cyst a cyst formed by the slow seepage of an exudate into a closed cavity.
false cyst pseudocyst (def. 1).
follicular cyst one due to occlusion of the duct of a follicle or small gland, especially one formed by enlargement of a graafian follicle as a result of accumulated transudate.
hydatid cyst the larval stage of the tapeworms Echinococcus granulosis and E. multilocularis; each one contains daughter cysts that have many scoleces (mouths). See also hydatid disease. Called also echinococcus cyst and hydatid.
inclusion cyst one formed by the inclusion of a small portion of epithelium or mesothelium within connective tissue along a line of fusion of embryonic processes; several types are found in the oral and nasal regions.
keratinizing cyst one arising in the pilosebaceous apparatus, lined by stratified squamous epithelium and containing largely macerated keratin and often sufficient sebum to render the contents greasy or rancid.
meibomian cyst chalazion.
mucus retention cyst a mucus-containing retention cyst caused by blockage of a salivary gland duct.
multilocular cyst
1. a cyst containing several loculi or spaces.
2. a hydatid cyst with many small irregular cavities that may contain scoleces but generally little fluid.
3. a thick-walled cyst in the kidney, found in clusters and usually unilaterally. In children it contains blastema and may develop into a Wilms tumor.
myxoid cyst a nodular lesion usually overlying a distal interphalangeal finger joint in the dorsolateral or dorsomesial position, consisting of focal mucinous degeneration of the collagen of the dermis; not a true cyst, lacking an epithelial wall, it does not communicate with the underlying synovial space.
Naboth's c's (nabothian c's) cysts that occur when mucus-producing glands in the columnar epithelium of the uterine cervix become covered over by squamous epithelium resulting from metaplasia; they are usually found in the transformation zone of the cervix. Called also Naboth's or nabothian follicles.
nasoalveolar cyst (nasolabial cyst) a fissural cyst arising outside the bones at the junction of the globular portion of the medial nasal process, lateral nasal process, and maxillary process.
odontogenic cyst one derived from epithelium, usually containing fluid or semisolid material, which develops during various stages of odontogenesis; nearly always enclosed within bone.
parasitic cyst one forming around larval parasites (tapeworms, amebas, trichinae), such as a hydatid cyst.
periapical cyst a periodontal cyst involving the apex of an erupted tooth.
perineurial cyst an outpouching of the perineurial space on the extradural portion of the posterior sacral or coccygeal nerve roots at the junction of the root and ganglion; it may cause low back pain and sciatica.
periodontal cyst one in the periodontal ligament and adjacent structures, usually at the apex of the tooth (periapical cyst).
pilar cyst a type of epidermal cyst, almost always found on the scalp, arising from the outer root sheath of the hair follicle.
pilonidal cyst see pilonidal cyst.
radicular cyst an epithelium-lined sac at the apex of a tooth.
Rathke's c's (Rathke's cleft c's) groups of epithelial cells forming small colloid-filled cysts in the pars intermedia of the pituitary gland; they are vestiges of Rathke's pouch and are closely related to craniopharyngiomas.
retention cyst a tumorlike accumulation of a secretion formed when the outlet of a secreting gland is obstructed. These cysts may develop in any of the secretory glands, such as the breast, pancreas, kidney, salivary or sebaceous glands, or mucous membranes.
sarcosporidian cyst sarcocyst (def. 2).
sebaceous cyst see sebaceous cyst.
solitary bone cyst a pathologic bone space in the metaphyses of long bones of growing children; it may be either empty or filled with fluid and have a delicate connective tissue lining.
subchondral cyst a bone cyst within the fused epiphysis beneath the articular plate.
tarry cyst
1. one resulting from hemorrhage into a corpus luteum.
2. a bloody cyst resulting from endometriosis.
theca-lutein cyst a cyst of the ovary in which the cystic cavity is lined with theca cells.
traumatic bone cyst a cavity (not a true cyst) formed in bone, particularly the mandible, in response to trauma. The hematoma precipitated by trauma is resorbed but bone is not replaced; the space formed is usually empty and lacks an epithelial lining.
unicameral bone cyst solitary bone cyst.
wolffian cyst a cyst of the broad ligament developed from vestiges of the mesonephros.

hy·da·tid cyst

a cyst formed in the liver, or, less frequently, elsewhere, by the larval stage of Echinococcus, chiefly in ruminants; two morphologic forms caused by Echinococcus granulosus are found in humans: the unilocular hydatid cyst and the osseous hydatid cyst; a third form in humans is the alveolar hydatid cyst, caused by Echinococcus multilocularis.
Synonym(s): echinococcus cyst, hydatid (1)

hy·da·tid cyst

(hī'dă-tid sist)
A lesion formed in the liver, brain, and many other body sites by the larval metacestode stage of Echinococcus, chiefly in herbivores and humans; two morphologic forms caused by metacestodes of E. granulosus are found in humans; the unilocular hydatid cyst and the osseous hydatid cyst; two other forms in humans include the alveolar hydatid cyst, caused by the metacestode of E. multilocularis and the polycystic hydatid, caused by E. vogeli and E. oligarthus.
Synonym(s): echinococcus cyst, hydatid (1) .

hydatid cyst

the bladder-like larva of some tapeworms, such as Echinococcus, that produces an enormous bladder up to five litres in capacity, which may bud off many smaller cysts. In mammals, cysts occurring in the brain produce symptoms of epilepsy.
References in periodicals archive ?
In the present study, the commonest symptom of hydatid cyst of liver was mass per abdomen in 21 patients (51.2%) followed by pain in abdomen in 20 patients (48.8%) and nausea in 34.1% & dyspepsia in 24.4% while the least common complaint was jaundice present in only 1(4.9%) patient.
Hydatid Cyst Cases with Different Localization: Region of Erzurum.
The highest rate of infection 59.3% was observed in female as 67 of 113 were infected with hydatid cyst while , 30.7% was the prevalence rate of males as 23 of total 75 were infected.
Scolicidal effects of olea europaea and satureja khuzestanica extracts on protoscolices of hydatid cysts. Korean J Parasitol 2012; 50: 53-6.
The scolicidal effects of Allium sativum flowers on hydatid cyst protoscolices have also been used with success.
In gender terms, they have not found statistically significant difference between ELISA IgG positivity and sex and age of the patient and the location of hydatid cysts. In our study, 57% Echinococcus IgG positivity in overall pulmonary hydatid cyst patients is similar to that in the literature.
There is also a hydatid cyst (black arrow) in the liver (L) parenchyma with peripheral focal areas of calcification the lesion was a hydatid cyst.
Concentrations were distributed on test tubes, each containing the Kerb's Ringer medium with hydatid cyst fluid and by 1:4 respectively.
Clinical tools routinely used to diagnose Hydatid Cyst are ultrasonography (USG), computed tomography (CT) along with serological testing whereas magnetic resonance cholangio-pancreatography (MRCP), endoscopic retrograde cholangio-pancreatography (ERCP) are used as imaging modalities for complicated hydatid cyst indicating cysto-billiary fistulas and collection.5 In this case we will be presenting a rare manifestation of hydatid cyst of liver with pancreatitis, cholangitis and jaundice due to formation of Hepatobiliary fistula.
Pulmonary hydatid cyst disease is still an important clinical problem in countries where echinococcus infections are endemic (1).
Human infestation by the larval stage of the parasite can lead to hydatid cyst formation in any organ, pleural cavity, or peritoneal cavity, as the larvae gain access to the portal circulation after ingestion of contaminated food.