A 72-year-old man presented to our hospital for a screening colonoscopy, during which a pedunculated, 4-cm polyp was found in the ascending colon (A). Before removing the polyp by snare cautery, we secured an endoloop at its base. On removal of the polyp, there appeared to be an opening from which fat protruded (B). Multiple unsuccessful attempts were made to close the defect with clips. The area was tattooed, and further attempts to close the defect were aborted. The surgical team was then consulted because of our high suspicion for perforation, and it was decided to take the patient emergently to surgery. In surgery, the tattooed area was located, and it was noted that there were no signs of perforation. A 5 X 5 cm, rubbery mass was felt at the tattooed area (C), and a right hemicolectomy was performed (D). The pathology specimen confirmed the presence of a submucosal lipoma that focally involved the mucosa at the site of the polyp, thereby mimicking a perforation.
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机译：一名72岁男子到我院接受结肠镜检查，其间在升结肠中发现带蒂的4厘米息肉（A）。在通过网罗烧灼术去除息肉之前，我们在其底部固定了一个内环。除去息肉后，似乎有一个开口，脂肪从该开口突出（B）。进行了多次失败的尝试，用夹子将缺陷闭合。该区域被刺上了纹身，进一步关闭该缺陷的尝试被中止。由于对穿孔的高度怀疑，因此请教了外科手术小组，并决定紧急将患者送去接受手术。在外科手术中，找到了纹身的区域，并且注意到没有穿孔的迹象。在纹身区域感觉到5 X 5厘米的橡胶状肿块（C），并进行了右半结肠切除术（D）。病理标本证实存在粘膜下脂肪瘤，该粘膜下脂肪瘤聚焦于息肉部位的粘膜，从而模拟了穿孔。
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