All of the following statements regarding nasolabial cyst are TRUE, EXCEPT:
**Core Concept**
Nasolabial cysts, also known as nasoalveolar cysts, are a type of odontogenic cyst that arises from epithelial remnants trapped between the nasal cavity and the maxillary alveolus during embryonic development. They are typically found in the anterior nasal floor and can cause symptoms due to their submucosal location.
**Why the Correct Answer is Right**
The correct answer, **Option A: Arises from odontoid epithelium**, is incorrect because nasolabial cysts actually arise from nasolacrimal duct remnants, not odontoid epithelium. This is a critical distinction, as odontoid epithelium is associated with other types of odontogenic cysts, such as odontogenic keratocysts. The mechanism of formation for nasolabial cysts involves the entrapment of nasolacrimal duct epithelium between the nasal cavity and the maxillary alveolus during embryonic development.
**Why Each Wrong Option is Incorrect**
**Option B:** Presents submucosally in anterior nasal floor - This statement is true, as nasolabial cysts are indeed characterized by their submucosal location in the anterior nasal floor.
**Option C:** Bilateral - This statement is also true, as nasolabial cysts can occur bilaterally.
**Option D:** Usually seen in adults - This statement is true as well, as nasolabial cysts tend to present in adults, often asymptomatic and incidentally discovered.
**Clinical Pearl / High-Yield Fact**
Nasolabial cysts are often asymptomatic, but can cause nasal obstruction, nasal discharge, or facial pain due to their submucosal location. They are typically diagnosed with imaging studies, such as CT or MRI, and can be managed with surgical excision.
**✓ Correct Answer: A. Arises from odontoid epithelium**