Ansswer: a,b,c
Any facial swelling due to infection is a potential life-threatening condition, which can spread to other areas via fascial planes and terminate with airway compromise. The infection is no longer limited to the periradicular region and conventional nsrct will not suffice. In addition, if the practiotioner does not have adequate support staff, facilities and skill to perform the procedure, referral is recommended. A traceable fistula can usually be treated successfully with nsrct.

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