探讨成人右半结肠切除术中意外发现右结肠系膜疝1例，以提高对该疾病的正确认识。

选取山东大学齐鲁医院结直肠外科1例术中发现小肠旋转不良后证实为右结肠系膜疝的病例的诊治过程，并复习相关文献。

本例患者为中年男性，因升结肠憩室炎，保守治疗效果差行腹腔镜右半结肠切除术，术中意外发现小肠旋转不良，后手术顺利完成，患者恢复顺利出院。

成人先天性小肠旋转不良发病罕见，往往最终在术中确诊，相关影像学检查有助于诊断该疾病，此外术前应仔细阅读CT图像，识别可能存在的变异，以便于术中从容应对，最大程度保证患者的生命安全。

To investigate a case of right mesocolic hernia accidentally found during right hemicolectomy in adults, so as to improve the correct understanding of this disease.

A case of right mesocolic hernia was selected from the Department of Colorectal Surgery of Qilu Hospital of Shandong University, and the relevant literature was reviewed.

The patient was a middle-aged male who underwent laparoscopic right hemicolectomy due to poor conservative treatment for ascending colon diverticulitis. Malrotation of the small intestine was accidentally found during the operation. The operation was successfully completed and the patient was discharged successfully.

Congenital malrotation of the small intestine in adults is rare and usually diagnosed during surgery. Relevant imaging examinations are helpful for diagnosis of the disease. In addition, CT images should be carefully read before surgery to identify possible variations, so as to calmly cope with them during surgery and ensure the life safety of patients to the greatest extent.