卵巢T1高信号良性病变信号分析

目的探讨卵巢T1高信号常见良性病变信号特点及机制。方法回顾手术及病理证实的16例卵巢T1高信号良性病变,分析术前T1WI/TSE、T2WI/TSE、T2WI/SPAIR序列图像,观察T1WI高信号强度和均质性、T2WI和SPAIR信号强度。结果 16例患者发现31个T1高信号病灶。子宫内膜异位囊肿8例17个病灶,T1WI显著高信号16个、中等高信号1个,均匀12个、不均5个,T2WI、SPAIR高信号15个、低信号2个。浆液性囊腺瘤出血2例2个病灶,T1WI中等高信号,均匀,T2WI、SPAIR高信号。成熟性囊性畸胎瘤3例6个病灶,T1WI显著高信号,不均,都有T1WI、T2WI高信号且SPAIR信号减低灶。甲状腺肿1例2个病灶,T1WI稍高信号,均匀,T2WI、SPAIR高信号。粘液性囊腺瘤2例4个病灶,T1WI中等高信号2个、稍高信号2个,均匀,T2WI、SPAIR高信号3个、低信号1个。结论卵巢良性病变MRI中,出血比蛋白质引起的T1高信号更强、更不均质,但二者信号有重叠,还需要结合其他影像学征象和临床信息加以鉴别。卵巢含脂肪成分良性病变T1高信号在脂肪抑制序列特异性减低,容易确诊。

The MR Signal Analysis of Ovarian Benign Lesions with T1 Hyperintense

Objective To investigate the characteristics and mechanisms of ovarian benign lesions with T1 hyperintense. Methods 16 cases of ovarian benign lesions with T1 hyperintense were reviewed. They were confirmed by surgery and pathology. The MRI sequences included T1WI/TSE, T2WI/TSE and T2WI/SPAIR. The signal intensity and homogeneity of T1WI and the signal intensity of T2WI and SPAIR were observed. Results 31 lesions with T1 hyperintense were found. 17 lesions were Endometriotic cysts (T1WI: significantly high signal 16, medium high signal 1, homogeneous 12, heterogeneity 5, T2WI and SPAIR: high signal 15, low signal 2). 2 lesions were serous cystadenoma hemorrhage (T1WI: medium high signal, homogeneous, T2WI and SPAIR:high signal). 6 lesions were mature cystic teratoma (T1WI: significantly high signal, heterogeneity, high signal reduced on SPAIR). 2 lesions were goiter (T1WI: slightly higher signal, homogeneous, T2WI and SPAIR: high signal). 4 lesions were mucinous cystadenoma (T1WI: medium high signal 2, slightly higher signal 2, homogeneous, T2WI and SPAIR: high signal 3, low signal 1). Conclusion Although the signal intensity of ovary benign lesions with hemorrhagic were stronger and more homogeneous than that of protein on T1WI, but the MR signals also had overlap. More imaging features and clinical informations can help diagnose. Fat composition of ovary benign lesions were easy to confirm because of the specific signal reduction on fat suppression sequence.