I am working on a specific study and I think it is unique because I want to minimize false negative staging in mediastinal LN, so what has been conducted was using the Pathology report and took all the positve or negative LN dissected during surgery, then we go to PET/CT imaging and see these LNs and took some quantitative data for each LN. After that, we correlate these quantitative data with the Pathology result to see if these quantitative data will improve staging and minimise FN nodes by using ROC and AUC statistical processes. I need your opinion on my study because I am concerned about the idea When I was looking at the Pathology report I saw these nodes in PET/CT, is correct? because PET/CT said negative and the patient with cN1, not cN2.?!