Nasopalatine duct cyst. Fluctuant swelling of the anterior hard palate.

Cyst of the incisive papilla. Swelling of theincisive papilla .

Nasopalatine duct cyst . Well-circumscribedradiolucency between and apical to the roots of the maxillary

central incisors.

Nasopalatine duct cyst . Well-circumscribedradiolucency between and apical to the roots of the maxillary

central incisors.

Nasopalatine duct cyst . large destructive cyst ofthe palate.

Nasopalatine duct cyst. Cystic lining showingtransition from pseudostratifled columnar to stratified squamous

epithelium.

Nasopalatine duct cyst. Flattened cuboidal epithelial lining.

Nasopalatine duct cyst. Cyst wall showing bloodvessels, nerve bundles, and minor salivary glands.

Oral lymphoepithelial cyst. Small yellowish-whitenodule of the tonsillar fossa.

Oral lymphoepithelial cyst. Small white nodule ofthe posterior lateral border of the tongue .

Oral lymphoepithelial cyst. A. low-power view showing a keratin -filled cyst belowthe mucosal surface. lymphoid tissue is present in the cyst wall. B. High-power view showinglymphoid tissue adjacent to the cystic lining.

Cervical lymphoepithelial cyst. Fluctuant swellingof the lateral neck.

Cervicallymphoepithelial cyst.Medium-poweredview showing a cyst lined by stratified squamous epithelium. Note

the lymphoid tissue in the cyst wall.

Thyroglossal duct cyst. Swelling (arrow) of theanterior midline of the neck.

Thyroglossal duct cyst . Cyst (top) lined bystratified squamous epithelium. Thyroid follicles can be seen in

the cyst wall (bottom).

Dermoid cyst. Fluctuant midline swelling in thefloor ofthe mouth.

Dermoid cyst. Squamous epithelia l lining (top).with hair follicle (F) and sebaceous glands (s) in the cyst wall.

Epidermoid cyst . Fluctuant nodule at the lateraledge of the eyebrow.

Epidermoid cyst. Infant with a mass in the upper lip.

Epidermoid cyst. A. l ow-power view showing a keratin-filled cystic cavity. B, Highpowered view showing stratified squamous epithelial lining with

orthokeratin production.

Globulomaxillary cyst. " Inverted pear-shapedradiolucency (arrow) between the maxillary right cuspid and

the lateral incisor. Biopsy revealed a periapical cyst.

Epstein'spearl s. Small keratin -filled cysts at thejunction of the hard and soft palates.

Nasolabia l cyst . A. Enlargement of the left upper lip with elevation of the ala of the

nose. B. Intraoral swelling fills the maxillary labial fold.

Nasolabial cyst . Pseudostratified columnar epithelial lining.

Median palatal cyst. Well-circumscribed radiolucencyapical to the maxillary incisors in th e midline. At surgery

th e lesion was unrelated to the incisive canal.

Hemihyperplasia. Enlargement of the right side of the face.

Hemihyperplasia. Same patient as depicted in. with associated enlargement of the right half of the tongue.

Hemihyperplasia. Radiograph of the same patient. Mandible and teeth on the right side are enlarged.

Progressive hemifacial atrophy. Young girl withright-sided facial atrophy.

"cloverleaf" skull

Crouzon syndrome. Ocular proptosisand midface hypoplasia.

Apert syndrome. Radiograph showing "towerskull," midface hypoplasia, and digitalmarkings. Similardigitalimpressions are apparent in people with Crouzon syndrome.

Apert syndrome. Syndactyly of the hand.

Apert syndrome. Abnormal shape of the maxilla,with swellings of the posterior lateral hard palate,

resulting in pseudocleft formation.

Mandibulofacial dysostosis. Patient exhibits a hypoplastic mandible, downwardslanting palpebral fissures, and ear deformities.