1. Nasopalatine Duct Cyst INCISIVE CANAL CYST

2. the most common nonodontogenic cyst of the oral cavity (in about 1% of the population). arise from remnants of the nasopalatine duct, an embryologic structure connecting the oral and nasal cavities in the area of the incisive canal. incisive canals begin on the floor of the nasal cavity on either side of the nasal septum,......... downward and forward to exit the palatal bone via a common foramen in the area of the incisive papilla these canals contain..... 1.nasopalatine ducts 2.Nasopalatine nerve 3.branches of the descending palatine and sphenopalatine arteries.

3. Although the pathogenesis of this lesion is still uncertain..... but.................. spontaneous cystic degeneration of remnants of the nasopalatine duct. any age / most common in the fourth to sixth decades of life The most common presenting symptoms......... swelling of the anterior palate, drainage, and pain many lesions are asymptomatic Fluctuant swelling of the anterior hard palate.

4. 1.incisive canal type (intraosseous) 2.originating in the papilla palatina. (within soft tissue with no radiographic changes) Almost all nasopalatine duct cysts occur within the incisive canal. at any level between the nasal and the oral cavity teardrop shape and shows a well demarcated, slightly sclerotic border. Some cysts may have an inverted pear shape The central incisors gave vital responses to pulp tests. superimposition of the nasal spine.......classic heart shape Radiographic features

5. cysts of the incisive papilla.....In rare instances in the soft tissues of the incisive papilla area without any bony involvement.

6. a larger incisive canal cyst with a more ill defined border.

7. Nasopalatine Duct Cyst superimposition over the apex of a central incisor. differential diagnosis periapical lesions the vitality of the teeth

8. The highly variable epithelial lining............... ♦ Stratified squamous epithelium.......... most common ♦ Pseudostratified columnarepithelium.... approximately 1/3 cases ♦ Simple columnar epithelium ♦ Simple cuboidal epithelium Histopathology

9. Respiratory pseudostratified columnar epithelium(arrow1). The fibrous connective tissue capsule contains focal areas of chronic inflammation 1 2 Cilia and goblet cells maybe found in association with columnar linings Epithelial lining

10. cuboidal cells with an uninflamed capsule

11. . Those originating higher in the canal are usually lined by respiratory epithelium those located toward tile oral cavity feature a squamous lining. The type of epithelium is mainly dependent upon the location of the lesion

12. the presence of numerous large nerves(arrow1) and blood vessels(arrow2). (These, of course, represent the normal structures that pass through the incisive canal.) 2 1 2 moderate-sized nerves and small muscular arteries and veins

13. Peripheral Nerve Bundles (40X10)

14. Large Vein

15. In biopsy specimens from this area ( a normal component of the papilla palatina.) Occasionally… irr egular cartilage

16. Bleeding Secondary to Surgical Procedure

17. Mucous Glands