WordNet

a continuous tube formed by a row of elongated cells lacking intervening end walls
an enclosed conduit for a fluid
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance; "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snakes fangs" (同)epithelial duct, canal, channel
a closed sac that develops abnormally in some body structure

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送水管;(建物・船などの)通気管;(地下ケーブルなどの)ダクト / (体液を運ぶ)導管,(植物が水・空気を運ぶ)導管
胞嚢(ほうのう)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/11/28 22:59:13」(JST)

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Identical images with heart-shaped radiolucency highlighted in right film.

The nasopalatine duct cyst (abbreviated NPDC) occurs in the median of the palate, usually anterior to first molars. It often appears between the roots of the maxillary central incisors. Radiographically, it may often appear as a heart-shaped radiolucency. It is usually asymptomatic, but may sometimes produce an elevation in the anterior portion of the palate. It was first described by Meyer in 1914.^[1]

The median palatal cyst has recently been identified as a possible posterior version of the nasopalatine duct cyst.

Etiology and diagnosis

Historically, the etiology of nasopalatine duct cysts has been somewhat of an enigma. Although it was originally postulated that the cyst formed from trapped epithelial cells during embryonic fusion of the palatal bones,^[2] it is now thought that it forms from oronasal ducts present within the incisive canals.^[3]^[4]

As a cyst, the nasopalatine duct cyst requires histological analysis for a definitive diagnosis. Radiographically, the nasopalatine cyst appears as a well-demarcated round, ovoid, or heart-shaped structure presenting in the midline of the maxilla.^[5]

Incidence

The nasopalatine cyst is the most common non-odontogenic cyst of the oral cavity, at an estimated occurrence rate of 73%.^[6]

Clinical presentation and treatment

Nasopalatine duct cysts usually present as asymptomatic palatal swellings, but they may rarely be accompanied by pain and/or purulent discharge.^[7] The cysts are generally treated by excision.

References

^ Meyer, AW. A unique supernumerary paranasal sinus directly above the superior incisors. J Anat 1914;48:118-129.
^ Albayram, MS, et al. Radiology quiz case: Nasopalatine duct cyst. Arch Otolaryngol Head Neck Surg 2001;127:1283-1285.
^ Gnanasekhar, JD, et al. Misdiagnosis and mismanagement of a nasopalatine duct cyst and its corrective therapy: A case report. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1995;80:465-470.
^ Swanson, KS, et al. Nasopalatine duct cyst: An analysis of 334 cases. J Oral Maxillofac Surg 1991;49:268-271.
^ Elliott, KA, et al. Diagnosis and surgical management of nasopalatine duct cysts. Laryngoscope 2004;114:1336-1340.
^ Daley TD, et al. Relative incidence of odontogenic tumors and oral and jaw cysts in a Canadian population. Oral Surg Oral Med Oral Pathol 1994;77:276-280.
^ Vasconcelos, RF, et al. Retrospective analysis of 31 cases of nasopalatine duct cyst. Oral Dis 1999;5:325-328.

UpToDate Contents

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1. 甲状舌管嚢胞および異所性甲状腺 thyroglossal duct cysts and ectopic thyroid
2. 総胆管損傷の修復 repair of common bile duct injuries
3. 頚部腫瘤の鑑別診断 differential diagnosis of a neck mass
4. 小児における鼻涙管閉塞（涙管閉鎖症） nasolacrimal duct obstruction dacryostenosis in children
5. 肝内胆管の消失および胆管消失症候群 hepatic ductopenia and vanishing bile duct syndrome

English Journal

Radiographic volume analysis as a novel tool to determine nasopalatine duct cyst dimensions and its association with presenting symptoms and postoperative complications.

Suter VG1, Warnakulasuriya S, Reichart PA, Bornstein MM.
Clinical oral investigations.Clin Oral Investig.2015 Sep;19(7):1611-8. doi: 10.1007/s00784-014-1391-2. Epub 2015 Jan 13.
OBJECTIVES: The aims of the study were to use cone beam computed tomography (CBCT) images of nasopalatine duct cysts (NPDC) and to calculate the diameter, surface area, and 3D-volume using a custom-made software program. Furthermore, any associations of dimensions of NPDC with age, gender, presence/
PMID 25579059

Unilateral nasopalatine duct cyst.

Wu YH1, Wang YP2, Kok SH3, Chang JY4.
Journal of the Formosan Medical Association = Taiwan yi zhi.J Formos Med Assoc.2015 Aug 29. pii: S0929-6646(15)00303-4. doi: 10.1016/j.jfma.2015.08.005. [Epub ahead of print]
PMID 26329385

Evaluation of a possible association between a history of dentoalveolar injury and the shape and size of the nasopalatine canal.

Suter VG1, Jacobs R, Brücker MR, Furher A, Frank J, von Arx T, Bornstein MM.
Clinical oral investigations.Clin Oral Investig.2015 Aug 7. [Epub ahead of print]
OBJECTIVES: Maxillary incisors (MI) are often affected by dentoalveolar injury resulting in tooth devitalization and apical periodontitis. The aim of the present study was to analyze any association between a history of dentoalveolar injury and the shape and size of the nasopalatine canal (NC) using
PMID 26245273

Japanese Journal

内部に結石を有した鼻口蓋管嚢胞の1例

谷口真一,木下靖朗,前多雅仁 [他]
愛知学院大学歯学会誌 51(2), 127-133, 2013-06
NAID 40019777677

臨床鼻腔に開放した鼻口蓋管囊胞例

南和彦,坂本進,西村一成 [他],市丸和之,佐藤進一,土師知行
耳鼻咽喉科臨床 106(3), 207-212, 2013
… The nasopalatine duct cyst is one of the nonodontogenic epithelial cysts and it arises from the epithelial remnants of the nasopalatine duct of the fetus. … The cyst was endoscopically opened to the bilateral nasal cavity under general anesthesia. …
NAID 130003374026