卵巢甲状腺肿的MRI表现及其误诊分析

目的 分析卵巢甲状腺肿(SO)的MRI表现,分析其影像学误诊的原因.方法 回顾性分析经手术和病理证实的5例SO的MRI表现,总结其MRI影像表现的特点.结果 5例SO的MRI表现为:(1)病变常为单侧发病;(2)肿块最大径3.6~13 cm,大小约为37.8~854.1 cm3;(3)肿块呈不规则形2例,类圆形2例,浅分叶状1例;(4)肿块边界清楚,邻近脏器受压,未见明显侵犯,其中1例出现中等量腹水;(5)肿块呈多房囊性或囊实性肿块,囊腔大小不一,T1 WI呈低、等、稍高信号,T2 WI部分囊腔呈高信号,部分囊腔呈等、低信号,各囊腔信号均匀,囊腔间可有不规则的实性成分及厚分隔,增强扫描后实性部分、囊壁及分隔明显强化.结论 正确认识SO的MRI表现,可有效提高SO诊断正确率,避免误诊.

MRI features of struma ovarii and analysis of misdiagnosis

Objective To explore MRI features of struma ovarii (SO)and analyze the causes of misdiagnosis.Methods The MRI data of 5 patients with SO confirmed by surgery and pathology were analyzed retrospectively.Results The MRI features of SO were summarized as follows:(1)The lesions were often unilateral.(2)The maximal diameter was 3.6-13 cm and the volume was 37.8-854.1 cm3 .(3)The irregular shape was presented in 2 cases,round shape was presented in 2 cases,and superficial lobulated shape was presented in 1 case.(4)The boundary of the lesions was clear,and the adjacent organs were compressed without obvious inva-sion,there was 1 patient showing moderate ascites.(5 )The tumor was cystic or solid-cystic with various size,and capsular space showed homogeneous high,equal or low signal intensity on T1 WI and T2 WI.Irregular solid component and thick separation were be-tween capsular spaces.The wall,solid component,and separation showed significant contrast-enhancement.Conclusion Recognition of the MRI features of SO could improve the diagnostic accuracy and avoid misdiagnosis.