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

Figure 4 Endoscopic ultrasonography images of cases with esophageal leiomyoma. A: Case 1, a submucosal elevation was observed 25 cm from the incisors with a smooth surface. After water immersion, a 12 MHz miniprobe scan revealed a well-defined, homogenous, hypoechoic lesion originating from the muscularis mucosae, measuring approximately 0.39 cm × 0.60 cm in cross-section. The surrounding esophageal wall layers appeared normal; B: Case 2, a submucosal elevation was observed 27 cm from the incisors with a smooth surface. After water immersion, a 12 MHz miniprobe scan revealed a well-defined, homogenous, hypoechoic lesion originating from the muscularis mucosae, measuring approximately 0.65 cm × 0.40 cm in cross-section. The surrounding esophageal wall layers appeared normal; C: Case 3, conventional gastroscopy revealed a spindle-shaped submucosal elevation approximately 1.0 cm in length, located 33 cm from the incisors, with localized surface depression. After water immersion, a 12 MHz miniprobe scan showed a well-defined, homogenous, hypoechoic lesion originating from the muscularis mucosae, measuring approximately 0.59 cm × 0.36 cm in cross-section. The surrounding esophageal wall layers appeared normal.