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Figure 3c: False-negative mediastinal lymph node metastasis at integrated PET/CT in 55-year-old woman with adenocarcinoma of the lung. (a) Lung window view of transverse CT scan (2.5-mm collimation, 170 mA) shows 25-mm nodule (arrow) with lobulated and spiculated margins in left upper lobe. (b) Mediastinal window view of transverse unenhanced CT scan (5.0-mm collimation, 80 mA) at level of azygos arch shows 8-mm (short-axis diameter) lymph node (arrow) in paraaortic area (nodal station 6). Transverse (c) PET and (d) integrated PET/CT scans at level similar to b demonstrate paraaortic node (arrow) showing little FDG uptake (maximum SUV = 2.0). Node was interpreted as benign and proved to be malignant at histopathologic examination of dissected nodes.
