胆囊胆固醇息肉的MRI表现

MRI features of gallbladder cholesterol polyps

目的探讨胆囊胆固醇息肉MRI表现特征,提高胆囊胆固醇息肉MRI诊断水平。方法回顾性分析经手术和病理证实的41例胆囊胆固醇息肉的MRI资料。结果 41例中38例胆囊体部可见病灶,占92.7%;直径最大11mm,最小3mm,平均5.3mm;19例呈单发,14例呈多发,8例呈弥漫分布。41例中3例形态呈不规则形,6例呈条状,29例呈类圆形,3例呈多形性;30例病灶边界模糊,11例病灶边界清楚。41例中有38例T2WI呈等信号,占92.7%;有37例可见悬空征,占90.2%。结论胆囊胆固醇息肉具有相对特征性MRI表现:T2WI呈等信号、直径<1cm、悬空征,掌握这些MRI表现有利于提高诊断准确性。

Objective To describe and evaluate the MRI features of gallbladder cholesterol polyps（GCP） in order to raise awareness of the disease and the diagnosis level.Methods Clinical data and findings of MRI examination in 41 patients with pathologically confirmed GCP were reviewed retrospectively.Results Thirty-eight of the 41 cases with cholesterol polyps（92.7%） were detected in body of gallbladder.The diameter of GCP ranged from 3 mm to 11 mm,and the mean was 5.3 mm.Of 41 GCP,19 cases were solitary,14 were mulitiple and 8 were diffusely distributed.Among MRI images of 41 cases,the shape of GCP presented nearly round lesions in 29 cases,irregular in 3 cases,stripe-like in 6 cases and pleomorphism in 3 cases.The findings of MRI were observed in 41 cases,in which 11 cases showed well-defined border,30 shoued ill-defined border,38 shoued isointensity signal on T2WI（92.7%）,and 37 shoued a ＂hanging＂ sign（90.2%）.Conclusion The relative characteristic MRI findings for diagnosis of GCP include isointensity signal on T2WI,less than 1cm in diameter,＂hanging＂ sign.It would be helpful for improving the diagnosis accuracy if radiologists are getting aware of the features of GCP on MRI scanning.