Lateral periodontal cyst and ginival cyst of adult

 Introduction of lateral periodontal cyst

A slow-growing non-expansile odontogenic cyst derived from the rest of dental lamina exhibiting a lining of 2 to 3 layers of cuboidal cells and distinctive focal thickenings (plaques).

• Sometimes polycystic variant is present and known as a Botryoid cyst.

Clinical features

1. Most commonly present between premolars or between the roots of the incisor. 
2. The mean age of occurrence is 50 years.
3. Usually 1cm in diameter
4. It has a slow expansile rate.
5. Recurrence is rare.
6. Associated teeth are vital. 
   

Radiographic features

1. It appears well defined.
2. Unilocular.
3. Delicately corticated radiolucency. 
4. Present between roots of vital teeth.
   

Histopathology

1. The lining epithelium is non-keratinized with two to three layers of cuboidal cells.
2. But there are focal thickenings known as plaques.
3. The cell layer has glycogen-rich clear cells.
   
   

Treatment

Treatment is surgical enucleation. 

Gingival cyst of adult

• It is considered the extraosseous counterpart of lateral periodontal cyst
• All the features are the same including histology and time of occurrence.
• It is firm yet compressible fluid-filled swelling. 
• On a radiograph, it is not apparent but sometimes it can cause saucerization of the underlying bone.

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