1. کیست مجرای نازوپالاتین (کیست کانال انسیزیو)
گردآوری: امیر یاری
دانشگاه علوم پزشکی مشهد
دانشکده دندانپزشکی

2. Definition and Epidemiology
Is a developmental, nonneoplastic cyst that is considered to be the most common of the non-odontogenic cyst(70%).(1% of population)
Occurs in the incisive canal on midline of anterior maxilla
No racial predilection

3. Etiology and Pathogenesis
The persistence of epithelial remnants may later become the source of epithelia that gives rise to nasopalatine duct cyst, from either spontaneous proliferation.
Proliferation following trauma (eg, removable dentures), bacterial infection, or mucous retention also considered.

4. Diagnosis CLINICAL FEATURES
Asymptomatic.
Symmetric swelling in the anterior region of the palatal midline.
Vitality of the adjacent teeth must be checked to exclude the possibility of a radicular cyst.
Males>female( times)
It occurs over a wide age range (7-88 y).but Most patients who are affected are aged years.

5. Diagnosis RADIOGRAPHIC FEATURES
A radiolucent area between the central incisor teeth with the well defined sclerotic outline.
Cysts diameter in radiographic images may be from 6mm to 6cm. (Average size is 2.5cm)
May produce divergence of the roots of the maxillary incisor teeth.
Note: A radiolucency which is less than 6mm often is a normal incisive foramen.

6. Diagnosis HISTOLOGICAL FEATURES
Epithelial lining varies ranging from stratified squamous to cuboidal and to pseudo stratified columnar.
Relatively thick walls
Contains nerves ,blood vessels and accessory salivary glands which pass through the incisive canal and become incorporated in to the cyst wall.

7. Diagnosis HISTOLOGICAL FEATURES

8. Differential Diagnosis
Periapical granuloma and odontogenic cysts of the radicular type must be separated from the nasopalatine cyst.
A normal canal must also be considered.
In rare cases this cyst may appear in soft tissue. This lesions called Incisive papilla cyst(not incisive canal cyst).

9. Incisive canal cyst & Incisive papilla cyst

10. Prognosis and Treatment
Nasopalatine Duct cyst are slow growing
The treatment of choice is surgical enucleation
In large cysts, marsupialization may be considered prior to definitive enucleation
Recurrence rate is low.