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Nasopalatine duct cyst: an intaosseous developmental cyst of
the midline of the anterior palate, derived from the island of
epithelium remaining after closure of the embryonic nasopalatine
duct.
• The nasopalatine duct cyst, also termed incisive canal cyst, arises from
embryonic remnants of the nasopalatine duct.
• Most of these cysts develop in the midline of the anterior maxilla near
the incisive foramen.
Radiographical features:
• The nasopalatine duct cyst present as a well-
circumscribed oval or heart-shaped radiolucency
located in the midline of the anterior maxilla
between the roots of the central incisors.
Nasolabial cyst:• A developmental cyst of the soft tissue
of the anterior mucobuccal fold beneath
the ala of the nose.
• most likely derived from remnants of the
inferior portion of the nasolacrimal duct.
• Also known as the naso-alveolar cyst
and the klestadt cyst.
• this rare condition occurs entirely in the
soft tissues of the anterior maxillary
vestibule, below the ala of the nose and
deep in the nasolabial crease (fold).
Clinical features• This cyst is a unilateral or occasionally bilateral painless soft tissue swelling.
• If the upper lip is retracted, this cyst also can be seen inta-orally as a swelling
located at the depth of the maxillary vestibule.
• Most of these cysts occur in the fourth and fifth decades of life and have a
female predilection of approximately 3 to 1.
Histology:
• the cyst is lined by a layer of pseudo
stratified columnar epithelium exhibiting
variable numbers of mucus (goblet) cells or
by a ductal type of cuboidal epithelium.
• A lining of stratified squamous epithelium
can be seen in some lesion.
• Some degree of folding of the cyst lining
and of the associated connective tissue is
often seen.
• A narrow zone of dense, homogeneous,
fibrous tissue is usually seen adjacent to the
epithelial lining.
• Inflammation is generally absent.
Clinical features
• The oral lymphoepithelial cyst is most commonly found on the
anterior floor of the mouth and on the posterior lateral borders
of the tongue. However, it can also occur on the ventral surface
of the tongue, soft palate, tonsillar pillars, and oropharynx.
• It is a symptomatic, yellow or tan, superficial submucosal mass
that usually measures less than 1 cm in diameter .
CERVICALLYMPHOEPITHELIAL CYST.MEDIUM-POWERED VIEW SHOWING A CYST LINED BY STRATIFIED
SQUAMOUS EPITHELIUM. NOTE THE LYMPHOID TISSUE IN THE CYST WALL.
THYROGLOSSAL DUET CYST . CYST (TOP) LINED BY STRATIFIED SQUAMOUS EPITHELIUM. THYROID FOLLICLES CAN BE SEEN INTHE CYST WALL (BOTTOM).
DERMOID CYST. SQUAMOUS EPITHELIA L LINING (TOP).WITH HAIR FOLLICLE (F) AND SEBACEOUSGLANDS (S) IN THE CYST WALL.
EPIDERMOID CYST. A. L OW-POWER VIEW SHOWING A KERATIN-FILLED CYSTIC CAVITY. B, HIGHPOWERED VIEW SHOWING STRAT IFIED SQUAMOUS EPITHELIAL LINING WITH ORTHOKERATIN PRODUCTION.
Heterotopic oral Gastrointestinal cyst:• The heterotopic oral gastrointestinal cyst is a rare and unusual developmental
entity .
• most commonly found in the tongue or the floor of the mouth of infants or
young children.
• The theory of undifferentiated endodermal entrapment during the fourth or fifth
week of embryonic development, followed by gastrointestinal differentiation.
• This cyst is treated by surgical excision; recurrence is uncommon.
PALATAL CYST OF NEWBORN EPSTEIN'S PEARL S. SMALL KERATIN -FILLED CYSTS AT THEJUNCTION OF THE HARD AND SOFT PALATES.
MEDIAN PALATAL CYST. WELL-CIRCUMSCRIBED RADIOLUCENCYAPICAL TO THE MAXILLARY INCISORS IN THE MIDLINE. AT SURGERY THE LESION WAS UNRELATED TO THE INCISIVE CANAL.
HEMIHYPERPLASIA. SAME PATIENT AS DEPICTED IN. WITH ASSOCIATED ENLARGEMENT OF THE RIGHT HALF OF THE
TONGUE .
APERT SYNDROME. ABNORMAL SHAPE OF THE MAXILLA,WITH SWELLINGS OF THE POSTERIOR LATERAL HARD PALATE, RESULTING IN PSEUDOCLEFT FORMATION.