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Fig. 1A —Stage T1 adenocarcinoma in 54-year-old woman with left lower paratracheal lymph node metastasis on histopathologic examination. Axial thin-section (2.5-mm collimation) CT scan using lung window setting obtained at level of distal left main bronchus shows 22-mm nodule (arrow) with lobulated and spiculated margin in left upper lobe. Other mediastinal window setting images did not show any evidence of lymph node enlargement in mediastinum or hilum.