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Fig. 1A —78-year-old man with type 2 esophageal cancer located in
medial thoracic esophagus. Tumor was 105 mm; survival period was 2,694 days.
Transaxial contrast-enhanced CT scan through level of left mainstem bronchus
shows flattening of posterior wall. Diagnosis using CT alone was T4 based on
invasion of bronchus.