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Ciliated epithelium-lined radicular cysts.

P N Ramachandran Nair¹, Gion Pajarola, Hans-Ulrich Luder

¹Department of Oral Structural Biology, Center of Dental and Oral Medicine, University of Zurich, Switzerland.

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics

|October 11, 2002

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Three cases of ciliated epithelium-lined radicular cysts were found in apical periodontitis lesions. One cyst also showed Actinomyces infection, highlighting potential spread to the maxillary sinus.

Area of Science:

Oral pathology
Dental histology
Microbiology

Background:

Radicular cysts are common sequelae of apical periodontitis.
Epithelial lining of these cysts typically includes stratified squamous epithelium.

Purpose of the Study:

To identify and characterize ciliated epithelium-lined radicular cysts.
To investigate the presence of Actinomyces in periapical cysts.

Main Methods:

Review of 256 serial sections of apical periodontitis lesions.
Examination of identified cysts using transmission electron microscopy.
Histopathological analysis for epithelial types and microbial presence.

Main Results:

Three ciliated columnar epithelium-lined cysts were identified among 256 lesions.

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Two lesions were periapical pocket cysts, one was a true cyst.

One pocket cyst contained Actinomyces colonies; all affected maxillary premolars.

Conclusions:

Ciliated epithelium in radicular cysts may originate from the maxillary sinus.
Stratified squamous epithelium may arise from cell rests of Malassez.
Infection in pocket cysts, especially in posterior teeth, may spread to the maxillary sinus.