Epicenter is within a neurovascular canal (Inferior alveolar canal or nasopalatine canal)

Epicenter is located inferior to the inferior alveolar canal (IAC)

Single : There are no other related lesions present within the jaws.

Multiple : There are other related lesions within the jaws.

Well-defined : The periphery of the lesion is clearly demarcated.

Ill-defined : The borders of the lesion is not clearly demarcated.

Radiolucent : The density of the lesion is equal to air, fluid or soft tissue

Mixed : The lesion contains a mix of radiolucent and radiopaque components

Radiopaque : The density of the lesion is equal to bone.

Corticated : The lesion is demarcated by a well-defined radiopaque line.

Non-Corticated : There is no radiopaque line demarcating the lesion periphery

Unilocular : The lesion does not contain internal septations.

Multilocular : Contains internal septations.

Neither Unilocular nor multilocular : Does not appears to have a surrounding border or internal septations that would allow it to be defined as uni- or multi-locular

There is a radiolucent border surrounding the lesion, representing soft tissue encapsulation or PDL space.

Lesion is associated with a specific single tooth periapex

Yes :  The lesion is clearly associated with a single tooth.

No :  The lesion is not clearly associated with any one single tooth.

Lesion is in a follicular relationship with an associated tooth

Yes :  The lesion is associated with the crown or appears to arise from within the follicular space surrounding the crown.

No :  The lesion is not associated with the crown or does not appear to arise from within the follicular space surrounding the crown.

Demonstrating expansion that is significant relative to lesion size