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Abstract：
Mucinous cystic neoplasms (MCNs) are rare tumors primarily observed in the pancreas but occasionally found in other locations such as the retroperitoneum, ovary, liver, and spleen. These neoplasms are histologically classified based on the degree of dysplasia, with some associated with invasive carcinoma. Colorectal surgeons infrequently encounter MCNs. Mesenteric MCNs pose a diagnostic challenge secondary to their atypical location, subtle histology, and lack of specific biochemical markers. In this context, we present a case involving a 68-year-old female who initially presented with an assumed ovarian mass. Subsequent exploration revealed a 12 cm MCN situated in the sigmoid mesentery, a location seldom associated with these tumors. The patient underwent laparotomy with successful resection and recovery. Histopathological analysis confirmed the neoplasm\'s mucinous epithelium with a complex papillary architecture. Immunohistochemical staining supported the diagnosis, revealing positivity for CK7, SATB2, and CDX2.
摘要：
粘液性囊性肿瘤（MCNs）是罕见的肿瘤，主要在胰腺中观察到，但偶尔在其他位置发现，如腹膜后。子房,肝脏,还有脾脏.这些肿瘤根据发育不良的程度进行组织学分类，一些与浸润性癌有关。结直肠外科医生很少遇到MCNs。肠系膜MCNs对其非典型位置构成了诊断挑战，微妙的组织学，缺乏特异性的生化标志物。在这种情况下，我们提出一例病例,涉及一名68岁女性,她最初表现为卵巢包块.随后的探索发现位于乙状结肠肠系膜的12厘米MCN，很少与这些肿瘤相关的位置。患者进行了剖腹手术，成功切除并恢复。组织病理学分析证实肿瘤的黏液上皮具有复杂的乳头状结构。免疫组织化学染色支持诊断，显示CK7、SATB2和CDX2的阳性。
