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Abstract：
Small bowel tumors are relatively rare, representing only around 5% of all gastrointestinal neoplasms, with a progressively increasing incidence. Currently, there are no established guidelines for diagnostic approaches, screening procedures, or management strategies for small bowel tumors. We present here the case of a patient with a rare type of metastatic tumor of the small bowel originating from primary lung adenocarcinoma who presented with abdominal pain, severe iron-deficiency anemia, and melena. The initial investigations, gastroscopy and colonoscopy, failed to identify the bleeding source. The obscure bleeding source and diagnosis were achieved through power motorized spiral enteroscopy (MSE), which allowed the visualization and biopsy of the tumor. Histopathological examination established the presence of a poorly differentiated non-mucinous adenocarcinoma originating from the lung. This case is reported to provide evidence of the efficiency of MSE in the diagnosis of small bowel tumors, with the method providing higher insertion depth in a reduced amount of time.
摘要：
小肠肿瘤比较少见,仅占所有胃肠道肿瘤的5%左右，发病率逐渐增加。目前,没有既定的诊断方法指南，筛选程序，或小肠肿瘤的管理策略。我们在此介绍一例罕见的原发性肺腺癌小肠转移性肿瘤患者，该患者表现为腹痛，严重的缺铁性贫血,还有Melena.初步调查,胃镜和结肠镜检查，无法确定出血来源.通过动力电动螺旋小肠镜（MSE）实现不明出血来源和诊断，允许肿瘤的可视化和活检。组织病理学检查确定存在起源于肺的低分化非粘液性腺癌。据报道，该病例为MSE诊断小肠肿瘤的有效性提供了证据。该方法在减少的时间量内提供更高的插入深度。
