动脉瘤样骨囊肿的MRI表现(附8例报告)

MRI Manifestations of Aneurysmal Bone Cyst:A Report of 8 Cases

目的:评价 MRI 对动脉瘤样骨囊肿的诊断价值。材料与方法:对8例经手术病理证实为动脉瘤样骨囊肿的平片、CT 片和低场 MRI 表现进行对照分析。结果:动脉瘤样骨囊肿的 MRI 表现可归纳为:T_1WI 和 T_2WI 上均呈囊状膨胀性骨破坏,边缘表现为分叶状细薄的低信号强度环,病变于 T_1WI 为稍高于骨骼肌的不均匀信号强度,T_2WI 则构成多发囊腔状不均匀高信号强度,并间有多数低信号分隔线,囊腔内常出现液-液平面。结论:MRI 虽不能取代平片和 CT,但对动脉瘤样骨囊肿的范围及定性优于平片及CT。笔者认为动脉瘤样骨囊肿的影像学检查最佳方案是平片加 MRI。

Objective:To evaluate MRI in the diagnosis of aneurysmal bone cyst.Materials and Methods:Eight cases of aneurysmal bone cyst confirmed by operation and pathology were analyzed correlatively with findings of plain films,CT and low magnetic field MRI.Results:MR appearances of an aneurysmal bone cyst showed an expensile cystic lesion surrounded by a thin lobulated,low- signal intensity ring both on T_1-weighted and T_2-weighted images;the lesion was inhomogeneous slightly hyper-signal intensity than skeletal museles on T_1-weighted image and was cystic inhomogeneous high-signal intensity,mostly associated with multiple low-signal internal septations and fluid-fluid levels on T_2-weighted image.Conclusions:MRI is superior to plain films and CT in de- tecting the extent and nature of aneurysmal bone cyst,however it can not replace plain films and CT.The authors believe that the best method of imaging examinations is plain film plus MRI for aneurysmal bone cyst.