Aoki S, Sasaki Y, Machida T, Tanioka H
Department of Radiology, Faculty of Medicine, University of Tokyo, Japan.
AJNR Am J Neuroradiol. 1990 Sep-Oct;11(5):935-8.
Linear enhancement (flare sign) along the dura mater that was continuous with or emanated from the dural margin of meningiomas was frequently observed on contrast-enhanced MR images obtained in 18 patients with intracranial meningiomas (surgically proved). Preoperative MR studies obtained at 1.5 T after administration of gadopentetate dimeglumine were reviewed retrospectively to determine the clinical significance of this sign. Thirteen (72%) of the 18 meningiomas exhibited the finding adjacent to the dural attachments. Four meningiomas of the cerebellopontine angle showed enhancement along the internal auditory canals. Three specimens of the dura adjacent to the tumor in different patients with this finding revealed proliferation of connective tissues abounding with vessels along the dura without definite tumor invasion. The flare sign is thought to be a common finding of meningiomas on contrast-enhanced MR images obtained with high-resolution sequences, and it is observable without tumor invasion. This sign in the cerebellopontine angle should not be misinterpreted as enhancement of acoustic schwannomas.
在18例经手术证实的颅内脑膜瘤患者的对比增强磁共振图像上，经常观察到沿硬脑膜的线性强化（光晕征），其与脑膜瘤的硬脑膜边缘连续或从硬脑膜边缘发出。回顾性分析18例在静脉注射钆喷酸葡胺后于1.5T进行的术前磁共振研究，以确定该征象的临床意义。18例脑膜瘤中有13例（72%）在硬脑膜附着处附近出现该表现。4例小脑桥脑角脑膜瘤沿内耳道出现强化。在不同患者中，对3例出现该表现的肿瘤旁硬脑膜标本进行检查，结果显示沿硬脑膜有大量富含血管的结缔组织增生，但无明确肿瘤侵犯。光晕征被认为是在高分辨率序列对比增强磁共振图像上脑膜瘤的常见表现，且在无肿瘤侵犯时即可观察到。小脑桥脑角的该征象不应被误诊为听神经瘤的强化。
