Diagnostic accuracy of endoscopic ultrasonography for rectal neuroendocrine neoplasms

Figure 2 Endoscopic ultrasonography findings of rectal neuroendocrine neoplasms. A: An egg-shaped lesion within the mucosa with an intermediate echo pattern and distinct border; B: A homogenous hypoechoic lesion with a distinct border within the submucosa; C: A round medium-echo lesion with a distinct border within the submucosa; D: A nodular neuroendocrine neoplasm located in both the mucosa and submucosa.