📝 “What are Key Features of the Dentigerous Cyst?”

- 10.3.24

Quick Review #239 - #pathology #oralpathology #doctorgallagher #oralsurgery #oralsurgeon #dentist #dentistry #dental #cyst #dentigerouscyst

A dentigerous cyst (also known as a follicular cyst) is the 2nd most common type of odontogenic cyst, usually associated with the crown of an unerupted or developing tooth.

Clinical Features:

• Age Group: Most frequently occurs in the 2nd to 3rd decades of life.

• Gender Prevalence: A slight male predilection has been noted.

• Location: Most commonly associated with the mandibular third molar, followed by the maxillary canine. However, it can occur around any unerupted tooth, including supernumerary and impacted teeth.

• Symptoms: Typically asymptomatic and are often discovered incidentally on routine radiographs. In larger cases, they may cause facial swelling, delayed eruption of the associated tooth, or displacement of adjacent teeth.

• Growth: Although they enlarge slowly, untreated cysts can lead to cortical bone expansion, displacement of adjacent teeth, or resorption of roots.

Radiographic Features:

• Location: Surrounds the crown of an unerupted tooth and is attached at the cementoenamel junction.

• Shape: Usually presents as a unilocular, well-defined, radiolucent lesion. Occasionally, if the cyst becomes secondarily infected or large, multilocular radiolucency may be observed.

• Borders: The borders are typically smooth and corticated.

• Size: Dentigerous cysts can vary in size from small, incidental findings to large lesions that displace adjacent structures.

Histopathological Features:

• Cyst Wall: The cystic lining is composed of a thin, non-keratinized stratified squamous epithelium, typically 2-4 cell layers thick. The fibrous capsule is usually composed of connective tissue, with scattered inflammation depending on whether the cyst is infected.

• Inflammatory Cells: Chronic inflammatory infiltrate, including lymphocytes and plasma cells, may be present in cases with secondary infection.

• Odontogenic Epithelium: Rests of odontogenic epithelium may be observed in the connective tissue capsule, which can potentially give rise to other odontogenic lesions, such as ameloblastomas or carcinomas, though this is rare.

• Fluid Content: The cyst lumen may contain clear, straw-colored fluid.

Differential Diagnosis:

• Odontogenic keratocyst (OKC): Distinguished by its more aggressive behavior, multilocular radiographic appearance, and parakeratinized histological lining.

• Ameloblastoma: May arise in association with an impacted tooth but demonstrates a more aggressive growth pattern.

References:

1. Yap, J. (2023, July 21). Dentigerous cyst. Radiopaedia.

2. Neville, B. W., Damm, D. D., Allen, C. M., & Chi, A. C. (2015). Oral and Maxillofacial Pathology (4th ed.). Saunders.

3. Regezi, J. A., Sciubba, J. J., & Jordan, R. C. (2016). Oral Pathology: Clinical Pathologic Correlations (7th ed.). Elsevier.

4. ChatGPT. 2024.

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