Methods:The features of two different gas-barium double contrast esophagus examinations of 40 cases with nonage upper esophageal carcinoma diagnosed by pathology were analyzed.
方法：对病理证实的40例早期上段食道癌，使用两种不同的气钡双重对比剂食道造影方法进行观察。
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Objective:To evaluate toluidine blue (TB) and Lugol's solution (LS) double staining in detecting early, superficial cancer of esophagus.