骶前尾肠囊肿的CT与MRI表现

CT and MRI Findings of Prescral-Retrorectal Tailgut Cysts

目的总结骶前尾肠囊肿的CT和MRI表现,提高对本病的认识。资料与方法回顾性分析2010年8月—2021年12月丽水市中医院经手术及病理证实的8例尾肠囊肿的影像资料,其中CT检查4例(增强2例),MRI检查5例(增强4例),分别观察病灶分房、对周围有无侵犯、密度(信号)及强化程度等。结果CT上病灶边界清楚,密度均匀,3例呈低密度,1例呈高密度,2例呈单囊,2例呈多房囊性,囊壁不厚,增强后无强化。MRI上病灶边界清楚,信号均匀,1例呈单房囊性,4例呈多房囊性,囊壁不厚。T1WI 4例呈低信号,1例呈高、低信号,T2WI均呈高信号,增强后无强化;1例边缘环状强化,术后证实恶变。结论尾肠囊肿影像学表现为单房或多房的囊性密度或信号,增强扫描无强化,结合发病部位及影像学特征,有助于提高尾肠囊肿的术前诊断。

Purpose To summarize the CT and MRI findings in patients with prescral-retrorectal tailgut cyst(TGC),and to improve the acknowledge of TGC.Materials and Methods The imaging data of 8 cases with retrorectal TGC confirmed by postoperative pathology in Lishui Chinese Medical Hospital from August 2010 to December 2021 were analyzed retrospectively.Among 8 cases,there were 4 cases with CT scan,including 2 cases with enhancement,and 5 cases with MRI scan,including 4 cases with enhancement.Compartmentalization,invasion of surrounding tissues or not,density(intensity),and the degree of enhancement were also observed.Results On CT imaging,all lesions were with clear boundary and homogeneous in density,there were 3 cases with low density,1 case with high density,2 cases with single cyst,2 case with multilocular cystic,and the cyst wall was not thick with no enhancement.On MR imaging,all lesions were with clear boundary with homogeneous intensity,there was 1 case with single-chamber cystic and 4 cases with multilocular cystic,and the cyst wall was not thick.There were 4 cases with low signal and 1 case with high and low signal on T1WI,all lesions were high signal on T2WI.There was exclusively one malignant lesion confirmed by surgery with edge enhancement.Conclusion The imaging manifestations of the retrorectal TGC are unilocular or multilocular cystic lesion without enhancement.Combining the location with imaging characteristics is helpful to improve the preoperative diagnosis of retrorectal TGC.