| 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) |
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| 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) |
| cerebellar cyst | A cyst usually occurring in the lateral cerebellar white matter; often a part of cerebellar astrocytoma. (05 Mar 2000) |
| rete cyst of ovary | A cyst derived from the germinal cords in the hilum of the ovary. (05 Mar 2000) |
| retention cyst | A cyst resulting from some obstruction to the excretory duct of a gland. Synonym: distention cyst, secretory cyst. (05 Mar 2000) |
| cervical 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) |
| Gorlin 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) |
| periapical cyst | An inflammatory odontogenic cyst derived histogenetically from Malassez' epithelial rests surrounding the root apex of a nonvital tooth. Synonym: periapical cyst, radicular cyst, root end cyst. (05 Mar 2000) |
| pericardial cyst | <radiology> 90% on right, 25% symptomatic, Differential diagnosis: epicardial lymph node, fat (with or without steroids), Morgagni hernia (12 Dec 1998) |
| granddaughter cyst | A tertiary cyst sometimes developed within a daughter cyst, as in the hydatid cyst of Echinococcus. (05 Mar 2000) |
| mesenteric cyst | A congenital thin-walled cyst of the abdomen between the leaves of the mesentery, which may be of wolffian or lymphatic duct origin. As it enlarges it may cause colicky pain and intestinal obstruction. (dorlamd, 27th ed) (12 Dec 1998) |
| periodontal cyst | An epithelium-lined sac containing fluid; usually found at the apex of a pulp-involved tooth. The lateral type occurs less frequently along the side of the root. (12 Dec 1998) |