A periradicular lesion is prima facie evidence of the presence of a canal space and

[Dr.Dohaithem]

A periradicular lesion is prima facie evidence of the presence of a canal space and necrotic tissue, even when a canal radiographically appears calcified.

[Dr.Dohaithem]

check these topics on our endo library :

- ETIOLOGY, PATHOGENESIS AND TREATMENT OF APICAL PERIODONTITIS
- A clinical classification of the status of the pulp and the root canal system

[Khaled Balto]

presence of radiographic signs of calcification is does not mean there will be an operative calcification. In my experience, even if the radiographic image shows signs of calcificaiton....you still find a canal clinicaly particulary if you are using magnification.

As a matter of fact the presence of an apical radiolucency indicates of the presence of microbial activity within the canal. However, its absence in cases of clinical calcification indicates aseptic necrosis