硬膜外脊膜瘤的影像学表现

发布时间：2018-04-05 19:31

本文选题：脊膜瘤　切入点：硬膜外　出处：《中国医学影像技术》2014年07期

【摘要】：目的观察扁平形硬膜外脊膜瘤的影像学表现。方法回顾性分析8例经手术病理证实的扁平形硬膜外脊膜瘤的影像学表现表现,并进行文献复习。结果 7例硬膜外脊膜瘤位于颈椎管,1例位于胸椎管,累及2~4个椎体节段;8例病灶均呈扁平形、以增厚的硬膜为基底,伴硬膜外肿块形成;5例肿瘤经椎间孔向硬膜外延伸、相应水平椎间孔扩大;椎管均均匀变窄,1例伴脊髓水肿,1例伴脊髓变性。CT显示病灶呈等密度,6例硬膜可见条片状钙化。MRI显示病灶于轴位图像上均呈半环形,包绕脊髓,T1WI上呈等(n=5)或低(n=3)信号,T2WI上呈等(n=3)或低信号(n=5);增强后呈中等(n=2)或明显(n=6)强化,其中7例强化均匀,1例不均匀。结论扁平形硬膜外脊膜瘤好发于颈椎管,可累及多个椎体节段,以硬膜增厚、钙化并硬膜外肿块形成为其特征。
[Abstract]:Objective to observe the imaging features of flat epidural meningioma.Methods the imaging findings of 8 cases of flat epidural meningioma confirmed by surgery and pathology were analyzed retrospectively and the literatures were reviewed.Results 7 cases of epidural meningioma were located in the cervical spinal canal and 1 case was located in the thoracic spinal canal. The lesions were flat in 8 cases involving 2 ~ 4 segments of vertebral body. The thickened dura mater was taken as the base, and 5 cases of tumors extended through the intervertebral foramen to the epidural canal with the formation of epidural mass.The corresponding horizontal intervertebral foramina was enlarged and the spinal canal narrowed evenly in 1 case with spinal cord edema and 1 case with spinal cord degeneration. Ct showed that the lesion presented isodensity and 6 cases showed strip calcification in dural. MRI showed that the lesion was semi-annular on axial image.The signal intensity on T _ 2WI was isochromatic or hypointense on T _ 1WI), or on T _ 2WI, the signal was isomorphous 3) or hypointense on T _ 2WI. After T _ 2WI, the signal intensity was moderate (n = 2) or obvious (n = 6)) enhancement, in which 7 cases showed homogeneous enhancement and 1 case was uneven.Conclusion the flattened epidural meningioma is prone to occur in the cervical spinal canal and may involve multiple segments of the vertebral body, characterized by thickening of the dura dural, calcification and formation of the epidural mass.
【作者单位】：北京大学第三医院放射科;
【分类号】：R445;R739.42

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