Current status of endoscopic resection for small rectal neuroendocrine tumors

Figure 1 Endoscopic diagnosis of rectal neuroendocrine tumors. A and B: The rectal neuroendocrine tumor typically appears as a small, yellowish, and subepithelial tumor-like lesion without surface change under white light or narrow band imaging as shown in case 1; C and D: For lesions with more significant elevation, there may be enlarged surface pit openings, but the overall shape remains unchanged, as seen in case 2; E and F: As the lesion grows larger, central depression may develop, accompanied by dilated micro-vessels, as illustrated in case 3.