Soulié D, Verdalle P, Derosier C, Cordoliani Y S, Poncet J L, Cosnard G
Service d'Imagerie Médicale, HIA du Val de Grâce, Paris.
Ann Otolaryngol Chir Cervicofac. 1995;112(8):381-6.
To assess the value of high resolution fast spin echo T2 weighted (HR-FSE T2w) sequence for the diagnosis of acoustic neuroma. Two criteria for normality of the HR-FSE T2w examination are defined.
114 patients underwent MR imaging at 1.5 T. The protocol included: axial images; 2 overlapped sequences focused on the internal auditory meatus (IAM), HR-FSE T2w acquisition (512 matrix, 3 mm sections with 1.5 mm overlapping); pre and postcontrast T1 weighted sequences focused on IAM. We defined two criteria for a normal HR-FSE T2w image: cerebellospinal fluid visible throughout the IAM, cochleo-vestibular and facial nerves visible in the IAM.
31 examinations were abnormal with HR-FSE T2w sequence, 25 lesions were found on postcontrast T1 weighted sequence (i.e. 6 false-positive results and none false-negative). The sensitivity, specificity and negative predictive value of this HR-FSE T2w sequence were 100%, 97% and 100% respectively.
the HR-FSE T2w sequence is the first-line method for detecting tumoral lesions of the IAM. If the 2 normality criteria are present on the HR-FSE T2w images, the T1w sequence with gadolinium injection is of no use; the injection of gadolinium remains necessary if only one of these criteria is lacking.
评估高分辨率快速自旋回波T2加权（HR-FSE T2w）序列在听神经瘤诊断中的价值。定义了HR-FSE T2w检查正常的两个标准。
114例患者在1.5T下行磁共振成像。检查方案包括：轴位图像；2个重叠序列聚焦于内听道（IAM），HR-FSE T2w采集（512矩阵，3mm层厚，层间距1.5mm）；聚焦于IAM的对比剂增强前后T1加权序列。我们定义了HR-FSE T2w图像正常的两个标准：整个IAM可见脑脊液，IAM可见蜗神经、前庭神经和面神经。
HR-FSE T2w序列检查中31例异常，对比剂增强T1加权序列发现25个病灶（即6例假阳性结果，无假阴性结果）。该HR-FSE T2w序列的敏感性、特异性和阴性预测值分别为100%、97%和100%。
HR-FSE T2w序列是检测IAM肿瘤性病变的一线方法。如果HR-FSE T2w图像上存在2个正常标准，则注射钆剂的T1w序列无用；如果仅缺少其中一个标准，则仍需要注射钆剂。
