目的：通过与TSE-T2WI对比，评价FLASH-T2*WI序列MR磁敏感加权成像（MSWI）在脑海绵状血管瘤（CCM）诊断中的价值和准确性。方法：回顾性分析27例经常规颅脑MR检查、加扫双回波FLASH-T2*WI（TE=15、35ms）磁敏感序列后诊断为CCM的病例，所有病例均经手术病理或临床证实。结果：①所有病灶在SE-T1WI及TSE-T2WI上呈低、中等、高或混杂信号；TSE-T2WI上共检出病灶99个，其中84个有磁敏感伪影，表现为“铁环征”63个（75%），完全低信号21个（25%）；双回波FLASH序列TE=15ms加权像上检出病灶234个，TE=35ms共检出423个，病灶均呈显著磁敏感伪影，表现为“铁环征”14个、完全低信号分别为220个（94.02%）和409个（96.69%）；三加权像上病灶内伪影的表现、大小及对比噪声比有显著差别。②19例病灶内的伪影区经病理证实17处为机化的血栓、含铁血黄素沉积及脑胶质增生。结论：“铁环征”或磁敏感伪影是诊断CCM的重要依据；FLASH-T2*WI序列MSWI对CCM的显示能力、准确性优于TSE序列，适当延长TE对CCM显示效果更好。

Objective: To evaluate the value and accuracy of magnetic susceptibility weighted imaging(MSWI) of FLASH-T2*WI sequence in the diagnosis of cerebral cavernous malformation(CCM) by comparing with TSE-T2WI. Methods: Twenty-seven patients performed with routine MR examination and dual echo FLASH-T2*WI(TE=15, 35ms) were analyzed retrospectively, all cases were confirmed by pathology or other methods. Results: ①All lesions on SE-T1WI and TSE-T2WI were depicted iso-, hyper-, hypo- or heterogeneous signal intensity, 99 lesions were detected by TSE-T2WI, and magnetic susceptibility artifact(MSA) was found in 84 lesions, 63(75%) of them were depicted as “hoop sign” and 21(25%) were completely hypo-intense; 234 and 423 lesions were found orderly by dual echo FLASH-T2*WI(TE=15, 35ms), MSA was present in all focus, 14 lesions were described as “hoop sign” and 220(94.02%), 409(96.69%) were absolutely hypo-intense, there were great difference of image signs, size and contrast to noise ratio(CNR) of MSA between the three weighted imagings. ②Seventeen lesions of 19 patients with “hoop sign” or MSA were confirmed as thrombus, hemosiderin or gliosis by pathology. Conclusion: “Hoop sign” or MSA was one of the important signs for CCM, MSWI of FLASH-T2*WI sequence is helpful in the diagnosis of CCM, and FLASH with long TE is better than short TE to show small lesions.