| parasitic cyst | A cyst formed by the larva of a metazoan parasite, such as a hydatid or trichinal cyst. (05 Mar 2000) |
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| 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) |
| residual cyst | The persistence of an apical periodontal cyst that remains after tooth extraction. (05 Mar 2000) |
| meibomian cyst | An inflammation of the oil gland of the eyelid. Also called a chalazian or a tarsal cyst. (12 Dec 1998) |