Endoscopic ultrasound using ultrasound probes for the diagnosis of early esophageal and gastric cancers

Figure 8 Findings for an sm1 cancer of the esophagus. A: Endoscopic features. A depressed, white, flat lesion was located on the posterior wall of the middle esophagus; B: Endoscopic features after iodine dye. Biopsy specimens showed squamous cell carcinoma; C: Endoscopic ultrasound (EUS) features. The white dotted line indicates the extent of the lesion. EUS revealed a thickness of the second layer and a disappearance of the third and fourth layer. The fifth layer seemed to be slightly irregular; D: The tumor was invading the submucosal layer to about 170 μm in depth. (Hematoxylin and eosin stain, × 40).