40例视神经炎的磁共振成像分析

目的 探讨ＭＲＩ对视神经炎的临床诊断价值。方法 用ＭＲＩ的频谱预饱和反转恢复序 液体衰变反转恢复序列检查４０例（７５只眼）诊断为视神经炎的患者。结果 ４０例（７５只眼）视神经炎的病灶多见于视的眶内段（８６．７％）和管内段（２９．３％），且以视神经的中轴（４９．３％）和全断面（３８．７％）为主。病灶长２～３５ｍｍ，平均１２．６ｍｍ。患者的视力与病变部位有关，且与病灶大小呈对数曲线负相关。视力差者（Ｐ

Magnetic resonance imaging in 40 cases of optic neuritis

OBJECTIVE: To explore the clinical value of magnetic resonance imaging (MRI) in optic neuritis. METHODS: Forty patients with optic neuritis were examined with the spectral presaturation inversion recovery and fluid attenuated inversion recovery. RESULTS: The lesion was frequently seen in orbital portion (86.7%) and intracanalicular portion (29.3%), and primarily in the axial part (49.3%) and transverse section (38.7%) of the optic nerve. The longitudinal extent of lesion was from 2 to 35 mm (mean, 12.6 mm), the visual acuity of patients with optic neuritis was related to the site of the lesion, and negatively correlated with the longitudinal extent of lesion of logarithm curve. A poor visual acuity (< 0.01) was significantly associated with lesion of greater extent > 10 mm and the transverse or axial lesion, but the good visual acuity (>or= 0.3), with the lesion of smaller extent < 10 mm and the axial or peripheral lesion. In addition, paramagnetic contrast-medium, Gd-DTPA, enhancement scanning was carried out in 11 cases of optic neuritis, of them the visual acuity was increased in 10 cases after administration of corticosteroid, and in one case, visual improvement was not seen. CONCLUSION: MRI is a new and useful equipment which is helpful in the diagnosis and treatment of optic neuritis.