Hi Ananth, while I am hoping that it turns out to be negative, I do suggest to move very fast on this. It really does not matter if the doctor ordered PET/CT or CT as should there be any thing suspicious, conclusions can be only drawn by a biopsy.
Regarding the report:
Your tongue came out to be all clear!
Are the affected lymph nodes on the same side of neck as your were operated (for tongue)?
When did you have the last CT and were there any observations about any lymph node?