| 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) |
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| 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) |
| parovarian cyst | A cyst of the epoophoron or parovarium, a vestigial structure associated with the ovary, consisting of a more cranial group of mesonephric tubules and a corresponding portion of the mesonephric duct. (12 Dec 1998) |
| gingival cyst | A cyst 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. (05 Mar 2000) |
| parvilocular cyst | A tumour composed of multiple small cyst's. (05 Mar 2000) |
| globulomaxillary cyst | A cyst of odontogenic origin found between the roots of the maxillary lateral incisor and canine teeth. (05 Mar 2000) |
| median anterior maxillary cyst | A cyst in or near the incisive canal, arising from proliferation of epithelial remnants of the nasopalatine duct; the most common maxillary development cyst. Synonym: median anterior maxillary cyst, nasopalatine duct cyst. (05 Mar 2000) |
| median palatal cyst | A developmental cyst located in the midline of the hard palate. (05 Mar 2000) |
| median raphe cyst of the penis | A cyst of the raphe penis resulting from incomplete closure of the urethral groove, becoming clinically evident in childhood or later. (05 Mar 2000) |
| mediastinal cyst | Cysts of one of the parts of the mediastinum: the superior part, containing the trachea, oesophagus, thoracic duct and thymus organs; the inferior middle part, containing the pericardium; the inferior anterior part containing some lymph nodes; and the inferior posterior part, containing the thoracic duct and oesophagus. (12 Dec 1998) |
| pearl cyst | <ophthalmology> A mass of epithelial cells introduced into the interior of the eye by a perforating injury. (21 Jun 2000) |
| vitellointestinal 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) |