尾肠囊肿的影像学表现

Imaging Features of Tailgut Cyst

目的 探讨尾肠囊肿的影像学特征。方法 回顾性分析6例尾肠囊肿的CT、MRI表现,4例均行腹部CT和MRI平扫加增强检查,1例行CT平扫,1例行MRI平扫加增强。结果 所有病变均发生于骶前间隙,4例表现为不规则形多囊改变、2例呈类圆形单囊改变,与周围组织分界清楚,(1)CT表现:呈水样或软组织样密度,囊壁及分隔均未见钙化,增强扫描囊内容物未见强化,囊壁及分隔可有强化;(2)MRI表现:T1WI信号多变,T2WI呈高信号,DWI呈高信号表现,增强扫描囊壁及分隔可有强化而囊内容物无强化。结论 MRI尤其是DWI序列有助于尾肠囊肿的定性诊断。

Objective To investigate the imaging features of tailgut cyst. Methods CT and MRI findings of 6 cases of caudal cyst were retrospectively analyzed. All 4 cases underwent abdominal CT and MRI plain scan plus enhancement examination, 1 case underwent CT plain scan and 1 case underwent MRI plain scan plus enhancement. Results All lesions occurred in the presacral space, 4 cases showed irregular polycystic changes, 2 cases showed circular monocystic changes, with clear boundaries.(1) CT findings: water-like or soft-tissue like density, no obvious solid components in the capsule, no calcification in the capsule walls and compartments, no enhancement in the contents of the enhanced scanning capsule, and enhancement in the capsule walls and compartments.(2) MRI manifestations: T1WI signals are variable, T2WI signals are high, DWI signals are high, enhanced scan capsule wall and partition can be enhanced, but the capsule contents are not. Conclusion MRI especially DWI sequence is helpful for qualitative diagnosis of caudal cyst.