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N3 nodal metastases. (a) CT shows a 2.5 cm tumor (arrow) in the left upper lobe. (b) Contrast-enhanced CT and (c) axial fused PET/CT show FDG-avid adenopathy in the right mediastinum in the paratracheal and prevascular regions (horizontal arrows). Biopsy confirmed nodal metastases in N3 (right paratracheal). Staging is T1N3M0, stage IIIB.
