肛管直肠原发性恶性黑色素瘤的CT和MRI诊断:2例报告并文献复习

发布时间：2018-01-11 22:07

本文关键词：肛管直肠原发性恶性黑色素瘤的CT和MRI诊断:2例报告并文献复习　出处：《医学影像学杂志》2016年01期 　论文类型：期刊论文

【摘要】：目的探讨早期及晚期肛管直肠原发性恶性黑色素瘤(AMM)的CT和MRI诊断。方法回顾性分析经病理证实的2例AMM患者的临床、CT、MRI和病理资料。结果 CT上早期者未见明显异常,晚期者肿瘤呈蕈伞样充满肠腔而不伴肠梗阻,肠周脂肪间隙模糊,并有淋巴结及远处转移。MRI上早期者肿瘤局限于直肠肛管内,T1WI呈高信号,T2WI呈低信号,晚期者肿瘤突破肠壁全层,侵及直肠系膜,并有淋巴结转移,T1WI呈等信号,T2WI呈高信号。结论AMM的CT和MRI表现具有一定特征性,MRI可用来鉴别肿瘤并评估肿瘤大小、浸润深度及淋巴结受累情况,CT有助于评估远处转移。
[Abstract]:Objective to investigate the CT and MRI diagnosis of primary anorectal malignant melanoma in early and late stage. Methods the clinical CT findings of 2 patients with AMM proved by pathology were retrospectively analyzed. MRI and pathological data. Results there was no obvious abnormality in the early stage of CT. In the late stage the tumor was filled with intestinal cavity without intestinal obstruction and the space of periintestinal fat was blurred. With lymph nodes and distant metastasis. MRI showed that the early tumors were located in the rectoanal canal and showed high signal intensity on T1WI and low signal intensity on T2WI. In the late stage, the tumors broke through the whole layer of the intestinal wall and invaded the mesorectum. With lymph node metastasis, T1WI showed high signal intensity on T1WI and T2WI. Conclusion CT and MRI features of AMM can be used to differentiate tumor and evaluate tumor size. Depth of invasion and lymph node involvement CT is helpful to evaluate distant metastasis.
【作者单位】：南京医科大学第一附属医院江苏省人民医院放射科;
【分类号】：R735.3;R730.44;R445.2
【正文快照】： Diagnostic values of CT and MRI for primary anorectal malignant melanoma:report of 2 cases and literature review肛管直肠原发性恶性黑色素瘤(anorectal ma-lignant melanoma,AMM)是一种较为少见且恶性度极高的肿瘤,约占全部黑色素瘤的1%,占肛管直肠恶性肿瘤的0.5%~2%

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