primordial cyst

primordial cyst,

one of three kinds of follicular cyst consisting of an epithelium-lined sac that contains fluid and appears radiographically as a light area in the affected jaw. It develops from a dental enamel organ before the formation of hard tissue. Compare dentigerous cyst, multilocular cyst.

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cyst (sist),

n a pathologic space in bone or soft tissue containing fluid or semifluid material and, in the oral regions, almost always lined by epithelium.

cyst, aneurysmal bone

n a nonmalignant osteolytic lesion expanding a long bone or within a vertebra in which the space, filled with blood, is networked with fibrous tissue containing multinucleated giant cells.

cyst, apical periodontal,

n See cyst, periapical.

cyst, branchial,

n (branchial cleft cyst), a soft-tissue cyst usually seen on the lateral side of the neck, arising from epithelial illusions within the cervical lymph nodes. Microscopic examination shows the epithelial lining of stratified squamous epithelium surrounded by lymphoid tissue.

Branchial cyst.

cyst, calcifying odontogenic (Gorlin cyst),

n a cyst arising from odontogenic epithelium, with abundant production of keratin-containing ghost cells and areas of dystrophic calcification. This lesion has a predilection for young adults.

cyst, dental,

n See cyst, periodontal.

n See cyst, eruption.

cyst, dentigerous

n an epithelium-lined sac filled with fluid or semifluid material that surrounds the crown of an unerupted tooth or odontoma.

cyst, dentoalveolar,

n See cyst, periodontal.

cyst, dermoid

n an epithelium-lined sac with one or more skin appendages (hair follicles, sweat glands, sebaceous glands) in its wall. It may be found in the floor of the oral cavity. This lesion should not be confused with the teratomatous dermoid cyst of the ovary.

Dentigerous cyst.

cyst, developmental,

n a pathologic fluid sac that may be caused by infection or disease. See also cyst, dentigerous and cyst, odontogenic.

cyst, epidermoid

n a fluid-filled, epithelium-lined sac thought to arise from hair follicles of the skin.

cyst, eruption,

n a dentigerous cyst that causes a clinically evident bulging of the overlying alveolar ridge.

cyst, extravasation,

n See cyst, traumatic.

cyst, fissural,

n a cyst that arises from the enslaved epithelium in maxillary suture lines caused by fusion of the embryonic processes of the facial bones.

cyst, follicular

n See cyst, dentigerous.

cyst, gingival, of the adult,

n a rare gingival cyst, usually painless, that originates on dental laminar rests. It is usually categorized as an extra-osseous instance of a lateral periodontal cyst.

cyst, gingival, of the newborn,

n a keratin-filled benign cyst on the alveolar mucosa that is common among newborn infants. Similar to palatal cysts of the newborn.

cyst, globulomaxillary

n thought to have been a developmental fissural cyst arising in the area between the nasal process and maxillary process. It is now believed that all these lesions are actually other odontogenic cysts, such as odontogenic keratocysts or lateral periodontal cysts.

cyst, Gorlin,

n See cyst, calcifying odontogenic (Gorlin cyst).

cyst, hemorrhagic

n an extravasation cyst or lesion; traumatic bone cyst or lesion. This is not a true cyst but is probably a defect in the bone produced by trauma and repair. It appears as a definite radiolucent area with a sharply marked radiopaque border. It contains air and is lined by a thin endosteum. See also cyst, solitary bone.

cyst, incisive canal,

n See cyst, nasopalatine.

cyst, indefinite bone,

n See cyst, traumatic.

cyst, lateral,

n See cyst, periodontal.

cyst, lateral periodontal (botryoid odontogenic cyst),

n a noninflammatory cyst found in the tooth-generating tissue on the lateral surface of the root of a tooth.

cyst, median palatal,

n an epithelium-lined sac containing fluid; appears as a radiolucency in the midline of the palate. It is of developmental origin.

cyst, multilocular

n a follicular cyst containing many loculi, or spaces, and not associated with a tooth.

cyst, nasoalveolar

n a fluid-containing sac lined by epithelium and located at the ala of the nose. A developmental cyst, it may simulate a nasal or periapical abscess.

n a cyst arising within the nasopalatine canal. Radiographically it may appear as a heart-shaped radiolucency between the maxillary central incisors. Histologically it may show mucous cells and nerve bundles in addition to a lining of stratified squamous or respiratory epithelium. The incisive canal cyst and the cyst of the papilla incisiva are the recognized subtypes.

cyst, nonodontogenic,

n a soft tissue abnormality that may develop in any number of locations within the oral cavity but is not directly associated with a tooth.

cyst, odontogenic,

n an epithelium-lined sac produced from the tooth-forming tissues (e.g., primordial, dentigerous, and periodontal cysts).

cyst, palatal, of the newborn,

n a common developmental cyst found on the hard palates of most infants. It is small, white, and filled with keratin. Called Epstein's pearls when found on the midline of the palate, and Bohn's nodules when found elsewhere on the palate, though both types are the same.

cyst, periapical,

n a cyst that has a fibrous connective tissue wall and a lining of stratified squamous epithelium and that is attached to the apex of the root of a tooth with a nonvital pulp or a defective root canal filling.

cyst, periodontal (dental root cyst, dentoalveolar cyst, lateral cyst, periapical cyst),

n an epithelium-lined sac containing fluid usually found at the apex of a pulp-involved tooth. Lateral types occur less frequently along the side of the root.

cyst, primordial

n an epithelium-lined sac containing fluid and appearing as a radiolucency in the jaws. It is derived from an enamel organ before any hard tissue is formed.

n See cyst, periapical.

cyst, residual,

n an odontogenic cyst that remains within the jaw after the removal of the tooth with which it was associated. May be radicular or follicular.

cyst, root end,

n See cyst, periapical.

cyst, simple bone,

n a diseased bone cavity that forms around the roots of teeth, easily identifiable during radiologic exam. Of uncertain origin. Previously known as traumatic bone cyst and solitary bone cyst.

cyst, soft tissue,

n a broad classification of oral abnormalities that may include blisterlike obstructions of salivary glands and growths in the thyroglossal tract, lymph nodes, and epithelial cells on the floor of the oral cavity.

cyst, soft tissue developmental,

n a pathologic fluid sac that occurs in mucous membranes or other soft tissue of the body, as opposed to those occurring in bone or teeth. See also cyst, thyroglossal duct and cyst, lateral cervical.

cyst, solitary bone,

n See cyst, simple bone.

n an epithelium-lined sac containing fluid formed in portions of the incompletely involuted thyroglossal duct, which connects the primitive pharynx with the tongue in embryonic life. These cysts may appear in the midline at any region from the subhyoid to the base of the tongue.

cyst, traumatic bone,

n See cyst, simple bone.