Figure 1.

A 67-year-old woman, with blood CEA of 14.95 ng/ml, was diagnosed with poorly differentiated adenocarcinoma in the inferior lobe of the left lung. Three different slices of integrated FDG-PET/CT images (A–C) and maximum intensity projection showed an SUV_max of the primary tumor of 9.4. Although there was no obvious mediastinal lymph nodal metastasis on imaging, the high SUV_max of the primary tumor and CEA level indicated that the patient might be at risk for lymph nodal metastasis. Pathologic results after surgery showed micro-metastases in subaortic and subcarinal lymph nodes (N2).