Nasopalatine Duct Cyst — ORE Part 1 MCQ

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ModerateRadiology & ImagingNasopalatine Duct CystORE Part 1

A 45-year-old man presents with a midline swelling of the anterior hard palate. A periapical radiograph shows a well-defined, heart-shaped (inverted pear) radiolucency between the roots of the upper central incisors. Both central incisors are vital. What is the most likely diagnosis?

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Correct answer: B — Nasopalatine duct cyst (incisive canal cyst)

Explanation lettering: C = shown as A · A = shown as B · E = shown as C · B = shown as D · D = shown as E

The correct answer is A: Nasopalatine duct cyst (incisive canal cyst). The pathognomonic combination of findings—a heart-shaped (inverted pear) radiolucency positioned between the roots of the maxillary central incisors with vital teeth—is diagnostic of NPDC. The cyst arises from embryologic remnants of the nasopalatine duct and is the most common non-odontogenic developmental cyst of the anterior maxilla. The critical distinguishing feature is that both central incisors are vital, ruling out odontogenic lesions (B, C, E), which require pulpal necrosis or association with unerupted teeth. Option D (median palatine cyst) is a different developmental non-odontogenic cyst located in the midpalate but lacks the characteristic heart-shaped interincisive morphology of NPDC.

Reference: PubMed Central (2024) 'Clinicopathological features of the nasopalatine duct cyst: A systematic review' and PubMed (2024) 'A brief insight regarding Nasopalatine duct cyst- Report of two cases with a review of literature'. https://pubmed.ncbi.nlm.nih.gov/39670133/