| branchial cyst | Also called a branchial cleft cyst, this is a cavity that is a remnant from embryologic development present at birth in one side of the neck just in front of the large angulated muscle on either side (the sternocleidomastoid muscle). The cyst may not be recognised until adolescence as it enlarges its oval shape. It may develop a sinus or drainage pathway to the surface of the skin from which mucus can be expressed. Total surgical excision is the treatment of choice. Recurrence is not expected. (12 Dec 1998) |
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| bronchogenic cyst | <radiology> Abnormality of primitive foregut (ventral segment = tracheobronchial tree; dorsal segment = oesophagus), lined with columnar respiratory epithelium, CT: water density (50%); higher density (50%); may have air/fluid level, mediastinal brochogenic cyst (86%), associated with spinal abnormalities, M:F = 1:1, stridor, dysphagia; usually assymptomatic, may communicate with tracheal lumen, location: posterior mediastinum (50%), pericarinal (35%), superior mediastinum (14%); usually on right, intrapulmonary bronchogenic cyst (14%), M>F; LL:UL = 2:1 (usually medial third), infection (75%), dyspnea, haemoptysis, 36% will eventually contain air (12 Dec 1998) |
| bursal cyst | A retention cyst in a bursa. (05 Mar 2000) |
| calcifying and keratinizing odontogenic cyst | A mixed radiolucent-radiopaque lesion of the jaws with features of both a cyst and a solid neoplasm; characterised microscopically by an epithelial lining showing a palisaded layer of columnar basal cells, presence of ghost cell keratinization, dentinoid, and calcification. Synonym: calcifying and keratinizing odontogenic cyst, Gorlin cyst. (05 Mar 2000) |
| calcifying odontogenic cyst | A mixed radiolucent-radiopaque lesion of the jaws with features of both a cyst and a solid neoplasm; characterised microscopically by an epithelial lining showing a palisaded layer of columnar basal cells, presence of ghost cell keratinization, dentinoid, and calcification. Synonym: calcifying and keratinizing odontogenic cyst, Gorlin cyst. (05 Mar 2000) |
| vaginal cyst | A closed sac on or under the vaginal mucosa that contains fluid or semi-solid material. These may occur secondary to trauma. Treatment may include surgical excision. (27 Sep 1997) |
| radicular cyst | Slow-growing fluid-filled epithelial sac at the apex of a tooth with a nonvital pulp or defective root canal filling. (12 Dec 1998) |
| ganglion cyst | <dermatology, tumour> A small cystic tumour, composed of ganglion cells, containing viscous fluid and connected either with a joint membrane or a tendon sheath. Commonly found on the back of the wrist, hands or feet. (27 Sep 1997) |
| Gartner's cyst | A cyst of the principal duct in the vestigial structures of the paroophoron in the cervix or anterolateral vaginal wall, corresponding to the sexual portion of mesonephros in the male. (05 Mar 2000) |
| gas cyst | A cyst with gaseous instead of the ordinary liquid or pultaceous contents. (05 Mar 2000) |
| pancreatic cyst | A true cyst of the pancreas to be distinguished from the much more common pancreatic pseudocyst by possessing a mucous epithelial lining. Pancreatic cysts are categorised as congenital, retention, neoplastic, parasitic, enterogenous, or dermoid. Congenital cysts occur more frequently as solitary cysts but may be multiple. Retention cysts are gross enlargements of pancreatic ducts secondary to ductal obstruction. (12 Dec 1998) |
| Rathke's cleft cyst | An intrasellar or suprasellar cyst lined by cuboidal epithelium derived from remnants of Rathke's pouch. (05 Mar 2000) |
| parasitic cyst | A cyst formed by the larva of a metazoan parasite, such as a hydatid or trichinal cyst. (05 Mar 2000) |
| parent cyst | A hydatid cyst from the inner, or germinal, layer, from which secondary cyst's containing scoleces (daughter cyst's) are developed; sometimes tertiary cyst's (granddaughter cyst's) are developed within the daughter cyst's; occurs most frequently in the liver, but may be found in other organs and tissues; symptoms are those of a tumour of the part affected. Synonym: parent cyst. (05 Mar 2000) |
| paroophoritic cyst | A cyst arising from the paroopheron. (05 Mar 2000) |