Figure 3-1. (A) Whole body 18F-FDG PET images of a patient with metastatic carcinoma of the esophagogastric junction show an area of increased uptake at the right paratracheal region (arrow). (B) Follow-up PET images obtained 3 months later show progression of the disease with increased FDG uptake at multiple supra-clavicular lymph nodes, axillary lymph nodes (arrows), and hilar lymph nodes (arrowhead). Also note hydronephrosis of the left ureter due to pelvic metastasis.

Figure 3-2. (A) Whole-body 18F-FDG PET images of a patient with recurrent carcinoma of the rectum in the pelvis (arrow) and mediastinal nodes (arrowheads). (B) CT scans of the pelvis show enlarged nodes (arrows) in the mesorectum and sigmoid mesocolon.

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