Bay cyst and true cyst

It has been suggested that radicular cysts can be divided into two main categories, bay cysts and true cysts. Bay cysts can be described as open bags where the cyst lumen is continuous with the necrotic root canal (picture on the left). True cysts, on the other hand, are structurally independent lesions inside the body of the periapical lesion (apical periodontitis) without continuity with the root canal.

Diagnosis between bay cyst and true cyst would require serial histological sectioning which may be too complex for routine purposes. However, a distinction of bay cysts from true cysts offers a possible explanation why some cysts apparently respond to conservative endodontic therapy (bay cysts) while others do not (true cysts). It also may explain the occurrence of residual cysts found after extraction of the tooth with AP.

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