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case_images: Defecography image.
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case_images: The lumen of the sigmoid colon was slightly narrowed, with an upper and lower range of about 3.3 cm, and the margin was not well defined, See Figure 1. The intestinal lumen was slightly narrowed, and the endoscope could barely pass through.
case_images: First colonoscopy image.
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case_images: Figure 2. Further CT examination suggested that: the intestinal wall at the junction of sigmoid colon and rectum was thickened with mass-like changes, the range was about 4.4cmx2.3cm, the measured CT value was about 49HU, after enhancement, moderate enhancement was seen, the CT value was about 75HU, the plasma membrane surface of the intestinal canal corresponding to the lesion was still smooth; the distribution and morphology of the remaining abdominal intestinal canal did not show obvious abnormal changes, the mesenteric fat gap was still clear, and no obvious enlarged lymph nodes were seen.
case_images: Pathological examination of the first colonoscopy biopsy.
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case_images: The pathological report is shown in Figure 3.
case_images: Pathological examination of the second colonoscopy biopsy.
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case_images: The pathological report is shown in Figure 4.
case_images: Pathological examination of the third colonoscopy biopsy.
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case_images: The pathological report of the third colonoscopy biopsy is the same as before, and the pathological report is shown in Figure 5.
case_images: Surgical removal of some intestinal tissue samples.
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case_images: The lesion was partially excised from the colon with adequate information, and endometriosis was considered in the intraoperative frozen section, and the excised tissue is shown in Figure 6.
case_images: Histopathological analysis following partial intestinal resection.
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case_images: The routine pathological report is shown in Figure 7, and the immunohistochemistry is shown in Figure 8.
case_images: Immunohistochemical investigation subsequent to partial intestinal resection.
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case_images: The routine pathological report is shown in Figure 7, and the immunohistochemistry is shown in Figure 8.