【摘要】 目的 探讨成人单纯终丝脂肪沉积的MRI表现,提高对该疾病的认识。方法 回顾性分析经MRI检查证实的成人单纯性终丝脂肪沉积的30例患者资料,分析MRI中所见终丝脂肪沉积的长度、厚度、形状、距圆锥距离、起止节段以及有无伴发腰椎间隙狭窄等情况。结果 终丝脂肪沉积的MRI表现为硬膜囊内终丝走行区弧形、波浪形或条形异常信号,各序列信号均与皮下脂肪信号一致,横断位T₁WI可见终丝部分或全部呈高信号改变。脂肪沉积段终丝长度平均值约（65.2±32.1） mm,厚度平均值约（3.2±0.8） mm。16例为弧形,2例为波浪形,12例为直条形。病变起始节段位于L1、L2、L3、L4椎体水平的分别为3例、14例、10例、1例;终止节段位于L3、L4、L5、S1、S2椎体水平的分别为11例、8例、3例、5例、1例;以及病变仅局限于L1/L2、L2/L3椎间隙水平的各1例。距圆锥距离平均值约（23.5±11.2） mm。其中13例患者有椎间隙狭窄,17例无椎间隙狭窄。结论 腰椎MRI能明确终丝脂肪沉积的存在、形态及位置,MRI上各序列信号均与皮下脂肪一致,矢状位T₁WI显示最为清晰。成人单纯终丝脂肪沉积可无神经功能症状。更多还原

【Abstract】 Objective To investigate MRI manifestations of pure filum terminale fat deposition in adults,and to improve the understanding of the disease.Methods The data of 30 adult patients with pure filum terminale fat deposition confirmed by MRI examination were analyzed retrospectively.The length,thickness,shape,distance from the cone,starting and ending segments and the presence or absence of lumbar intervertebral stenosis were analyzed.Results The MRI manifestations of filum terminale fat deposition showed that there were arc,wave or bar-shape abnormal signals within the area of dural sac.Various sequence signals coincided with those of subcutaneous fat and filum terminale partly or totally showed high signal intensity in the transverse position T₁ WI.The average length of filum terminale in the fat deposition segment was about（65.2±32.1） mm,and the average thickness was about（3.2±0.8） mm.Sixteen cases were in arc-shaped,2 cases in wave-shaped and 12 cases in bar-shaped.The number of starting segment of lesions located in the vertebral level of L1,L2,L3 and L4 was 3,14,10 and 1,respectively;the number of ending segment of lesions located in the vertebral level of L3,L4,L5,S1 and S2 was 11,8,3,5 and 1,respectively;and the number of lesions only located in the intervertebral level of L1/L2 and L2/L3 was 1 and 1,respectively.The average distance from the cone was about（23.5±11.2） mm.Among the 30 cases,13 presented with intervertebral space stenosis and 17 without intervertebral space stenosis.Conclusion Lumbar MRI can confirm the presence,shape and location of filum terminale fat deposition.The signals of various MRI sequences coincide with those of subcutaneous fat,where sagittal T₁ WI is the clearest.Pure filum terminale fat deposition in adults may not have the symptoms of nerve functional disturbance.更多还原