Unraveling the characteristics of early esophageal neuroendocrine carcinoma using multi-model endoscopy: A retrospective study of serial cases

Figure 3 Endoscopic ultrasonography images of cases 1 to 3. A: Case 1, after water immersion, a 12 MHz miniprobe scan revealed a well demarcated, homogenous, hypoechoic lesion measuring 0.94 cm × 0.36 cm within the muscularis mucosae; B: Case 2, after water immersion, a 12 MHz miniprobe scan revealed a lesion primarily characterized by thickening of the second layer with a measured thickness of 0.27 cm. The layer structure remained distinct, with intact muscularis propria and tunica albuginea; C: Case 3, after water immersion, a 12 MHz miniprobe scan revealed a hypoechoic lesion primarily involving the mucosal layer and partially extending into the superficial submucosa, with hypoechoic structures noted outside the esophageal wall.