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cyst

cyst (sist)

1. A bladder. 2. An abnormal sac containing gas, fluid, or a semisolid material, with a membranous lining. See also pseudocyst. [G. kystis, bladder]
adventitious c. pseudocyst (1)
allantoic c. urachal c
alveolar hydatid c. a hydatid c. of a multiloculate type, usually in the liver, caused by Echinococcus multilocularis, adults of which are in foxes; larvae (alveolar hydatid) are found chiefly in microtine rodents, but also among humans such as trappers and others handling pelts of infected foxes and other carnivores; growth is by exogenous budding and is not limited by an outer laminated membrane as in the hydatid c. from E. granulosus; necrosis, cavitation, contiguous spread, and death usually ensue.multilocular hydatid c., multiloculate hydatid c;
aneurysmal bone c. a solitary benign osteolytic lesion expanding a long bone or within a vertebra, consisting of blood-filled spaces, and separated by fibrous tissue containing multinucleated giant cells; such c.'s cause swelling, pain, and tenderness.benign bone aneurysm;
angioblastic c. mesenchymal tissue capable of forming blood in the embryo.
apical periodontal c. an inflammatory odontogenic c. derived histogenetically from Malassez' epithelial rests surrounding the root apex of a nonvital tooth.periapical c., radicular c., root end c;
apoplectic c. a pseudocyst formed of extravasated blood as in a stroke.
arachnoid c. a fluid-filled c. lined with arachnoid membrane, frequently situated near the lateral aspect of the fissure of Sylvius; usually congenital in origin.leptomeningeal c;
Baker's c. a collection of synovial fluid which has escaped from the knee joint or a bursa and formed a new synovial-lined sac in the popliteal space; seen in degenerative or other joint diseases.
Bartholin's c. a c. arising from the major vestibular gland or its ducts.
bile c. gallbladder
blood c. hemorrhagic c
blue dome c. 1. one of a number of small dark blue nodules or c.'s in the vaginal fornix due to retained menstrual blood in endometriosis affecting this region; 2. a benign retention c. of the mammary gland in fibrocystic disease, containing a pale slightly yellow fluid which gives a blue color to the c. when seen through the surrounding fibrous tissue.
bone c. See solitary bone c.
botryoid odontogenic c. a type of lateral periodontal c. that shows a multilocular growth pattern.
Boyer's c. a subhyoid c.
branchial c. a cervical c. arising from developmental persistence of ectodermal branchial grooves or endodermal pharyngeal pouches.branchial cleft c., cervical c. (1);
branchial cleft c. branchial c
bronchogenic c. a c. lined by ciliated columnar epithelium believed to represent bronchial differentiation; smooth muscle and mucous glands may be present.
bursal c. a retention c. in a bursa.
calcifying and keratinizing odontogenic c. calcifying odontogenic c
calcifying odontogenic c. a mixed radiolucent-radiopaque lesion of the jaws with features of both a c. and a solid neoplasm; characterized microscopically by an epithelial lining showing a palisaded layer of columnar basal cells, presence of ghost cell keratinization, dentinoid, and calcification.calcifying and keratinizing odontogenic c., Gorlin c;
cerebellar c. a c. usually occurring in the lateral cerebellar white matter; often a part of cerebellar astrocytoma.
cervical c. 1. branchial c 2. thyroglossal duct c
chocolate c. c. of the ovary with intracavitary hemorrhage and formation of a hematoma containing old brown blood; often seen with endometriosis of the ovary but occasionally with other types of c.'s.
choledochal c. c. originating from common bile duct; usually becomes apparent early in life as a right upper abdominal mass in association with jaundice.
chyle c. a circumscribed dilation of a lymphatic channel of the mesentery, containing chyle.
colloid c. a c. with gelatinous contents.
compound c. multilocular c
corpora lutea c.'s persistent corpora lutea with c. formation.
Cowper's c. a retention c. of a bulbourethral gland.
daughter c. a secondary c., usually multiple, derived from a mother c.
dental lamina c. a small keratin-filled c., usually multiple, on the alveolar ridge of newborn infants; derived from remnants of the dental lamina.
dentigerous c. an odontogenic c. derived from the reduced enamel epithelium surrounding the crown of an impacted or embedded tooth.follicular c. (2);
dermoid c. a tumor consisting of displaced ectodermal structures along lines of embryonic fusion, the wall being formed of epithelium-lined connective tissue, including skin appendages and containing keratin, sebum, and hair.dermoid tumor, dermoid (2) , inclusion dermoid, sequestration c;
dermoid c. of ovary a common benign cystic teratoma of the ovary, lined for the most part by skin, and containing hair and sebum, but also usually containing a variety of other well differentiated structures within a small inwardly projecting mass of solid tissue.
distention c. retention c
duplication c. a congenital cystic malformation attached to or originating from any part of the alimentary canal, from the base of the tongue to the anus, which reproduces the structure of the adjacent alimentary tract.
echinococcus c. hydatid c
endometrial c. a c. resulting from endometrial implantation outside the uterus, as in endometriosis.
endothelial c. a serous c. whose sac is lined with endothelium.
enterogenous c.'s mediastinal cysts derived from cells sequestered from the primitive foregut; may be classified histologically as bronchogenic, esophageal, or gastric.
ependymal c. a circumscribed distention of some portion of the central canal of the spinal cord or of the cerebral ventricles.neural c;
epidermal c. a c. formed of a mass of epidermal cells which, as a result of trauma, has been pushed beneath the epidermis; the c. is lined with stratified squamous epithelium and contains concentric layers of keratin.implantation c., inclusion c. (1);
epidermoid c. a spherical, unilocular c. of the dermis, comprised of encysted keratin and sebum; the c. is lined by a keratinizing epithelium resembling the epidermis derived from the follicular infundibulum.
epithelial c. a c. lined with epithelium.
eruption c. a form of dentigerous c. in the soft tissues in conjunction with an erupting tooth; seen on the alveolar ridge of children.
extravasation c. obsolete term for hemorrhagic c.
exudation c. a c. resulting from distention of a closed cavity, such as a bursa, by an excessive secretion of its normal fluid contents.
false c. pseudocyst (1)
fissural c. a c. derived from epithelial remnants entrapped along the fusion line of embryonal processes.inclusion c. (2);
follicular c. 1. a cystic graafian follicle; 2. dentigerous c
Gartner's c. a c. of the principal duct in the vestigial structures of the paroöphoron in the cervix or anterolateral vaginal wall, corresponding to the sexual portion of mesonephros in the male.
gas c. a c. with gaseous instead of the ordinary liquid or pultaceous contents.
gingival c. a c. derived from remnants of the dental lamina situated in the attached gingiva, occasionally producing superficial erosion of the cortical plate of bone; most are located in the cuspid-premolar region.
globulomaxillary c. (glo´bu-lo-maks´il-lar-e) a c. of odontogenic origin found between the roots of the maxillary lateral incisor and canine teeth.
glomerular c.'s c.'s formed by dilatation of Bowman's capsules, found in rare cases of congenital polycystic kidneys.
Gorlin c. calcifying odontogenic c
granddaughter c. a tertiary c. sometimes developed within a daughter c., as in the hydatid cyst of Echinococcus.
hemorrhagic c. a c. containing blood or resulting from the encapsulation of a hematoma.blood c., hematocele (1) , hematocyst, sanguineous c;
hepatic c.'s congenital c.'s thought to originate from an obstruction of biliary ductules; they may be solitary and range in size from small to enormous; polycystic disease may also occur.
heterotrophic oral gastrointestinal c. a c. of the oral cavity lined by gastric or intestinal mucosa from misplaced embryonic rests.
hydatid c. a c. formed in the liver, or, less frequently, elsewhere, by the larval stage of Echinococcus, chiefly in ruminants; two morphological forms caused by Echinococcus granulosus are found in humans: the unilocular hydatid c. and the osseous hydatid c.; a third form in humans is the alveolar hydatid c., caused by Echinococcus multilocularis.echinococcus c., hydatid (1);
implantation c. epidermal c
incisive canal c. a c. in or near the incisive canal, arising from proliferation of epithelial remnants of the nasopalatine duct; the most common maxillary development c.median anterior maxillary c., nasopalatine duct c;
inclusion c. 1. epidermal c 2. fissural c
involution c. a mammary c. occurring at the menopause, due to fibrocystic disease.
iodine c.'s obsolete term used to indicate the c.'s of Iodamoeba butschlii, characterized by a large iodine-positive glycogen vacuole.
junctional c. a c. of the testis arising from the structures connecting the rete testis with the epididymis.
keratinous c. an epithelial c. containing keratin.
Klestadt's c. nasoalveolar c
lacteal c. a retention c. in the mammary gland resulting from closure of a lactiferous duct.milk c;
lateral periodontal c. an intraosseous c., usually encountered in the cuspid-premolar region of the mandible, derived from the remnants of the dental lamina and representing the intraosseous counterpart of the gingival c.
leptomeningeal c. arachnoid c
lymphoepithelial c. a cervical c. arising from salivary gland epithelium entrapped in lymph nodes during embryogenesis. Also seen within the oral cavity.
median anterior maxillary c. incisive canal c
median palatal c. a developmental c. located in the midline of the hard palate.
median raphe c. of the penis a c. of the raphe penis resulting from incomplete closure of the urethral groove, becoming clinically evident in childhood or later.
meibomian c. chalazion
milk c. lacteal c
morgagnian c. vesicular appendices of uterine tube, under appendix
mother c. a hydatid c. from the inner, or germinal, layer, from which secondary c.'s containing scoleces (daughter c.'s) are developed; sometimes tertiary c.'s (granddaughter c.'s) are developed within the daughter c.'s; occurs most frequently in the liver, but may be found in other organs and tissues; symptoms are those of a tumor of the part affected.parent c;
mucous c. a retention c. resulting from obstruction in the duct of a mucous gland.mucocele;
multilocular c. a c. containing several compartments formed by membranous septa.compound c;
multilocular hydatid c. , multiloculate hydatid c. alveolar hydatid c
myxoid c. ganglion (2)
nabothian c. a retention c. that develops when a mucous gland of the cervix uteri is obstructed; of no pathologic significance.nabothian follicle;
nasoalveolar c. a soft tissue c. located near the attachment of the ala over the maxilla; probably derived from the lower anterior part of the nasolacrimal duct.Klestadt's c., nasolabial c;
nasolabial c. nasoalveolar c
nasopalatine duct c. incisive canal c
necrotic c. a c. due to a circumscribed encapsulated area of necrosis with subsequent liquefaction of the dead tissue.
neural c. ependymal c
neurenteric c.'s paravertebral c.'s commonly connected to the meninges or a portion of the gastrointestinal tract that develop due to incomplete separation of endoderm from the notochord during early fetal life; often symptomatic.
odontogenic c. a c. derived from odontogenic epithelium. [odont- + G. genos, birth, origin, + suffix -ic, pertaining to]
oil c. a c. resulting from loss of the epithelial lining of a sebaceous, dermoid, or lacteal c., or from the subcutaneous injection of oil or fat material.
omphalomesenteric c. cystic lesion found within the umbilical cord, presumed to develop from remnants of the omphalomesenteric duct early in gestation. May be found on antenatal ultrasound.omphalomesenteric duct c;
omphalomesenteric duct c. omphalomesenteric c
oophoritic c. ovarian c
osseous hydatid c. a morphological form of hydatid c. caused by Echinococcus granulosus, and found in the long bones or the pelvic arch of humans if the embryo is filtered out in bony tissue; in this site no limiting membrane forms and the c. grows in an uncontrolled fashion, producing cancellous structures and inducing fracture, followed by spread to new sites.
ovarian c. a cystic tumor of the ovary, either non-neoplastic (follicle, lutein, germinal inclusion, or endometrial) or neoplastic; usually restricted to benign c.'s, i.e., mucinous serous cystadenoma, or dermoid c.'s.oophoritic c;
paraphysial c.'s c.'s arising from vestigial remnants of the paraphysis; they are the possible origin of some third ventricular colloid c.'s.
parasitic c. a c. formed by the larva of a metazoan parasite, such as a hydatid or trichinal c.
parent c. mother c
paroophoritic c. a c. arising from the paroöpheron.
parvilocular c. a tumor composed of multiple small c.'s.
pearl c. a mass of epithelial cells introduced into the interior of the eye by a perforating injury.
periapical c. apical periodontal c
phaeomycotic c. a subcutaneous cystic granuloma caused by pigmented fungi, usually solitary and located on the extremities.
pilar c. a common c. of the skin and subcutis which contains sebum and keratin, and is lined by pale-staining stratified epithelial cells derived from follicular trichilemma.trichilemmal c;
piliferous c. a dermoid c. containing hair.
pilonidal c. See pilonidal sinus.
pineal c. a c. of the pineal gland; rarely of clinical importance.
posttraumatic leptomeningeal c. a persistent cystic accumulation of cerebrospinal fluid with progressive loss of bone and dura, occurring at the site of a previous fracture.
primordial c. a c. which develops in place of a tooth through cystic degeneration of the enamel organ prior to formation of calcified odontogenic tissue.
proliferating tricholemmal c. pilar tumor of scalp
proliferation c. , proliferative c. , proliferous c. a mother c. containing daughter c.'s; a c. with tumorous formation at one portion of the sac.
protozoan c. infectious form of many protozoan parasites such as Entamoeba histolytica, Giardia lamblia, Balantidium coli, etc., usually passed in the feces and provided with a highly condensed cytoplasm and resistant cell wall.
pseudomucinous c. a c. containing a gelatinous fluid, formerly thought to differ significantly from mucin, occurring especially in the ovary.
radicular c. apical periodontal c
Rathke's cleft c. an intrasellar or suprasellar c. lined by cuboidal epithelium derived from remnants of Rathke's pouch.
residual c. the persistence of an apical periodontal c. that remains after tooth extraction.
retention c. a c. resulting from some obstruction to the excretory duct of a gland.distention c., secretory c;
rete c. of ovary a c. derived from the germinal cords in the hilum of the ovary.
root end c. apical periodontal c
sanguineous c. hemorrhagic c
sebaceous c. a common c. of the skin and subcutis containing sebum and keratin, and lined by epithelium derived from the pilosebaceous follicle. See epidermoid c., pilar c.
secretory c. retention c
seminal vesical c. a c., usually congenital, of the seminal vesicle.
sequestration c. dermoid c
serous c. a c. containing clear serous fluid, such as a hygroma.
simple bone c. solitary bone c
solitary bone c. a unilocular c. containing serous fluid and lined with a thin layer of connective tissue, occurring usually in the shaft of a long bone in a child.idiopathic bone cavity, osteocystoma, simple bone c., traumatic bone c., unicameral bone c;
Stafne bone c. lingual salivary gland depression
static bone c. lingual salivary gland depression
sterile c. a hydatid c. without brood capsules or viable scoleces.
sublingual c. ranula (2)
suprasellar c. craniopharyngioma
surgical ciliated c. a c. that arises from maxillary sinus epithelium implanted along a line of surgical entry.
synovial c. ganglion (2)
Tarlov's c. a perineural c. found in the proximal radicles of the lower spinal cord; it is usually productive of symptoms.
tarry c. a c. or collection of old blood having a tarry or black, sticky appearance; usually due to endometriosis.
tarsal c. chalazion
teratomatous c. a c. containing structures derived from all three of the primary germ layers of the embryo.
thyroglossal duct c. , thyrolingual c. a c. in the midline of the neck resulting from nonclosure of a segment of the ductus thyroglossus.cervical c. (2);
Tornwaldt's c. pharyngeal bursa
traumatic bone c. solitary bone c
trichilemmal c. pilar c
tubular c. tubulocyst
umbilical c. vitellointestinal c
unicameral c. unilocular c
unicameral bone c. solitary bone c
unilocular c. a c. having a single sac.unicameral c;
unilocular hydatid c. the commonest form of hydatid c. in man, caused by Echinococcus granulosus and found in the liver, lungs, or any other site where the hexacanth embryo may settle if it passes the hepatic or pulmonary capillary filters; characterized by large balloon-like forms lined internally with a germinative membrane, enclosed externally in a laminated membrane within a host-parasite capsule, and filled with fluid (hydatid fluid) and infectious scoleces of the young tapeworms (hydatid sand).
urachal c. a c. of the urachus which may communicate with the umbilicus or bladder, or give rise to a mid-line swelling.allantoic c;
urinary c. a c. containing extravasated urine.
utricular c. dilatation of the utricular lumen; usually unilocular.
vitellointestinal c. a small red sessile or pedunculated tumor at the umbilicus in an infant; it is due to the persistence of a segment of the vitellointestinal duct.umbilical c;
wolffian c. a c. lying in the broad ligaments of the uterus and arising from any mesonephric structures.

 

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