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)

hydatid cyst

a cyst in the liver that contains larvae of the tapeworm Echinococcus granulosus, whose eggs are carried from the intestinal tract to the liver via the portal circulation. Patients are generally asymptomatic, except for hepatomegaly and a dull ache over the right upper quadrant of the abdomen. Radiological tests are used in diagnosis, and, because no medical treatment is available, surgical removal of the cyst is indicated. Compare hydatid mole.

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.

cyst

1. a closed epithelium-lined sac or capsule containing a liquid or semi-solid substance. Most cysts are harmless but 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. See also specific locations and organs.
2. a stage in the life cycle of certain parasites, during which they are enveloped in a protective wall. See also cystic.

aneurysmal cyst
see bone cyst.
blood c's
these are found in the carcasses of poultry at meat inspection. They are small round cystic lesions containing blood. They are hemangiomas.
branchial cyst, branchiogenic cyst, branchiogenous cyst
one formed from an incompletely closed branchial cleft. See also branchial cyst.
cervical c's
retention cysts of glands in the uterine cervix in the cow, are palpable as fluctuating masses on rectal examination. Called also nabothian cyst or follicle.
chocolate cyst
one filled with hemosiderin following local hemorrhage.
cutaneous cyst
see epidermal cyst, dermoid cyst, follicular cyst, sebaceous cyst.
daughter cyst
one that develops within a parent cyst, e.g. hydatid cyst.
dentigerous cyst
see dental cyst.
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.
epidermal inclusion cyst
see epithelial inclusion.
exudation cyst
a cyst formed by the slow seepage of an exudate into a closed cavity.
fatty cyst
formed when fat accumulates in large amounts and the cells break down forming a central mass of lipid surrounded by a multinuclear rim.
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.
Gartner's duct cyst
see cystic gartner's ducts.
horn cyst
intracutaneous cystic accumulations of keratin. Seen in trichoepitheliomas and basal cell tumors. Called also keratin cyst.
hybrid cyst
one combining elements of epidermoid and trichilemmal cysts.
hydatid cyst
the larval stage (metacestode) of the tapeworms Echinococcus granulosus and E. multilocularis. See also hydatid disease.
inclusion cyst
see epidermal cyst.
interdigital c's
see pododermatitis; interdigital pyoderma.
keratin 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 and often rancid.
lateral cervical cyst
see branchial cyst.
luteal c's
develop from ovarian follicles which fail to rupture but have a lining of luteal cells. Anestrus is the presenting clinical sign.
marine fish c's
worldwide occurrence in fish of round nodules in fibrous capsules; the cause is unknown.
meibomian cyst
mesenteric cyst
congenital, thin-walled cyst between the leaves of the mesentery; may enlarge and cause colic or even intestinal obstruction.
cyst mites
see laminosioptescysticola.
cyst of Morgagni
nabothian cyst
see cervical cyst (above).
orbital cyst
ovarian cyst
see cystic ovarian disease.
parasitic cyst
one forming around larval parasites (tapeworms, amebae, trichinae) that enter the body.
pseudohorn cyst
invagination of hyperplastic epidermis; not a true cyst.
retention cyst
a tumor-like accumulation of a secretion formed when the outlet of a secreting gland is obstructed. These cysts may develop in any of the secretory glands—the mammae, pancreas, kidney, salivary or sebaceous glands, and mucous membranes. See also renal retention cysts.
sarcosporidian c's
cylindrical cysts (schizonts) containing bradyzoites, found in the muscles of those infected with Sarcocystis spp.
subconjunctival cyst, conjunctival cyst
misplaced secretory tissue which causes a slowly enlarging, fluctuant subconjunctival mass.
uveal cyst
an acquired or congenital structure which may arise from the iris or the ciliary body. Visible as a mass attached to the iris or may be floating freely in the anterior chamber. Those arising from the ciliary body may not be visible. Seen most commonly in horses. See also iris cyst.
vitelline cyst
a congenital cyst lined with ciliated epithelium occurring along the gastrointestinal canal; the remains of the omphalomesenteric duct.

hydatid

1. a hydatid cyst.
2. any cyst-like structure.

hydatid cyst
the larval stage of the tapeworm Echinococcus granulosus or E. multilocularis, containing daughter cysts, each of which, if fertile, will have many protoscoleces; it is the cause of hydatid disease. Called also Echinococcus cyst and hydatid.
hydatid disease
an infection in humans, sheep, cattle, pigs and horses, and occasionally in many other mammal species. The infection is usually of the liver or lungs, caused by larval forms (hydatid cysts) of tapeworms of the genus Echinococcus, and characterized by the development of expanding cysts. In the infection caused by E. granulosus, single or multiple cysts that are unilocular in character are formed, and in that caused by E. multilocularis, the host's tissues are invaded and destroyed as the cyst(s) enlarge by peripheral budding. Called also echinococcosis.
false hydatid
see cysticercustenuicollis.
Morgagni's hydatid
sessile hydatid
the hydatid of Morgagni connected with a testis.
stalked hydatid
the hydatid of Morgagni connected with an oviduct.
References in periodicals archive ?
The diagnosis of muscular hydatid cyst was confirmed by histological examination and microbiological analysis (Figure 2).
The preferred imaging method depends on the involved organ and the growth phase of the hydatid cyst.
We reviewed Pap, HE, and Leishman stained smears from hepatic space occupying lesions (SOLs) of patients which were diagnosed as hydatid cysts.
In some patients the spinal hydatid cysts can grow to enormous sizes but clinically remain asymptomatic for years.
Primary hydatid cyst of the axillary region: a case report.
Numerous studies have been carried out on genetic characterization of hydatid cyst, using hydatid fluid, cystic membrane and scolices (16).
Resta, "Recurrent pulmonary embolism due to echinococcosis secondary to hepatic surgery for hydatid cysts," Journal of Computer Assisted Tomography, vol.
Hydatid cyst disease is a zoonosis caused by the larval stage of the parasite Echinococcus granulosus, a member of the order Cestoda, the family Taeniidae.
On pelvic CT and whole abdomen and suprapubic US, no abnormality compressing the sciatic nerve like a mass lesion and fracture was found except for the existing pelvic hydatid cyst.
Patients were treated for retrovesical hydatid cyst over 9 years (January 2004-December 2013).
Aspiration revealed crystal clear fluid which raised the suspicion of hydatid cyst.
26) To exclude a hydatid cyst in a patient with a cystic splenic mass, a serologic test for Echinococcus should be performed.