| epidermoid inclusion cyst | <radiology> Well-circumscribed radiolucent lesion showing a thin cortical margin that may not be visible in its entirety, frequently in the terminal phalanx, history of penetrating trauma is often elicited Differential diagnosis: ABC, enchondroma (12 Dec 1998) |
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| epithelial cyst | A cyst lined with epithelium. (05 Mar 2000) |
| eruption cyst | A form of dentigerous cyst in the soft tissues in conjunction with an erupting tooth; seen on the alveolar ridge of children. (05 Mar 2000) |
| tubular cyst | A cyst formed by the dilation of any occluded canal or tube. Synonym: tubular cyst. (05 Mar 2000) |
| junctional cyst | A cyst of the testis arising from the structures connecting the rete testis with the epididymis. (05 Mar 2000) |
| extravasation cyst | An obsolete term for haemorrhagic cyst. (05 Mar 2000) |
| exudation cyst | A cyst resulting from distention of a closed cavity, such as a bursa, by an excessive secretion of its normal fluid contents. (05 Mar 2000) |
| false cyst | 1. An accumulation of fluid in a cystlike loculus, but without an epithelial or other membranous lining. Synonym: adventitious cyst, false cyst. 2. A cyst whose wall is 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; 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: bradyzoite. Origin: pseudo-+ G. Kystis, bladder (05 Mar 2000) |
| keratinous cyst | An epithelial cyst containing keratin. (05 Mar 2000) |
| umbilical cyst | A small red sessile or pedunculated tumour at the umbilicus in an infant; it is due to the persistence of a segment of the vitellointestinal duct. Synonym: umbilical cyst. (05 Mar 2000) |
| unicameral cyst | A cyst having a single sac. Synonym: unicameral cyst. (05 Mar 2000) |
| unilocular cyst | A cyst having a single sac. Synonym: unicameral cyst. (05 Mar 2000) |
| unilocular hydatid cyst | The commonest form of hydatid cyst 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; characterised 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). (05 Mar 2000) |
| Klestadt's cyst | A soft tissue cyst located near the attachment of the ala over the maxilla; probably derived from the lower anterior part of the nasolacrimal duct. Synonym: Klestadt's cyst, nasolabial cyst. (05 Mar 2000) |
| urachal cyst | Cyst occurring in a persistent portion of the urachus, presenting as an extraperitoneal mass in the umbilical region. It is characterised by abdominal pain, and fever if infected. It may rupture, leading to peritonitis, or it may drain through the umbilicus. (12 Dec 1998) |