- It is a liquid-filled cavity lined with epithelium. It develops in a pre-existing periapical granuloma
- It has the same radiographic characteristics as periapical granuloma, but is usually larger in size.
- Round or oval radiolucency
- Well defined borders
- well corticated if longstanding
- The radiopaque border continuous with the Lamina Dura of the associated tooth. The apex of the tooth can frequently be identified within the lesion.
- The adjacent teeth can be displaced but are rarely resorbed.