PET/CECT Surveillance Legend:

Primary
1: No evidence of recurrence: routine surveillance, CECT
2: Low suspicion
a) Superficial abnormality (skin, mucosal surface, etc.): direct visual inspection 
b) Ill-defined deep abnormality with only mild FDG- short interval follow-up* or repeat PET/CECT at routine follow up
3: High suspicion (new or enlarging discrete nodule/mass with intense FDG uptake)- biopsy
4: Definitive recurrence (path proven or clinical progression): no biopsy needed
 
Nodes
1: No evidence of recurrence- routine surveillance
2: Low suspicion (residual nodal soft tissue with only mild/ intermediate FDG): short interval follow –up or repeat PET/CECT at routine follow-up
3: High suspicion (new, enlarging with intense FDG uptake) - biopsy
4: Definitive recurrence (biopsy proven or clinical progression): no biopsy needed

*short interval follow- up: 3 months at our institution

{Distant disease}- optional if interpreting whole body PET, same 1-4 categories