Retrorectal developmental cysts
in adults: Clinical and radiologic histopathologic review, differential diagnosis, and treatment.
It appears to represent an uncommon but consistent group of odontogenic developmental cysts
that cannot be classified as other established types and should therefore constitute its own clinical entity.
1) These developmental cysts
are nonodontogenic, extraosseous and locally expansile.
Mucous and ciliated cell metaplasia in epithelial linings of odontogenic inflammatory and developmental cysts
Nasolabial cysts are benign, slow-growing developmental cysts
occurring in the nasolabial folds below the alae nasi and are nonodontogenic, extraosseous and locally expansile.