Mulkens T H, Parizel P M, De Schepper A M, van de Heyning P H, Forton G E, Martin J J, Delaporte C
Department of Radiology, Antwerp University Hospital, Edegem, Belgium.
Rofo. 1993 Apr;158(4):362-7. doi: 10.1055/s-2008-1032664.
Magnetic resonance imaging (MRI) is now considered the diagnostic study of choice for evaluation of patients with suspected acoustic schwannoma. This retrospective study of 118 MR examinations presents an analysis of the MR findings of 89 acoustic tumours in 86 patients. The method of examination included precontrast and gadolinium(Gd)-enhanced MRI in 72 and plain MRI in 14 patients. The common MR-appearances of acoustic schwannomas were: on T1-weighted images (WI) isointense (36%) or slightly hypointense (64%) relative to the brainstem; intense and homogeneous contrast enhancement in 62%; the shape of the tumour was round or oval in 71%; the tumour was centred at/or located in the internal auditory canal (IAC) in 80%. The small acoustic schwannomas were mostly round or oval in shape and showed homogeneous signal intensity (SI) both before and after Gd. The larger acoustic tumours were more heterogeneous in morphology and SI. The significance of these and other signs, early diagnosis and differential diagnosis are discussed.
磁共振成像（MRI）现在被认为是评估疑似听神经鞘瘤患者的首选诊断检查方法。这项对118例MR检查的回顾性研究分析了86例患者中89个听神经瘤的MR表现。检查方法包括72例患者的对比剂前和钆（Gd）增强MRI以及14例患者的平扫MRI。听神经鞘瘤常见的MR表现为：在T1加权图像（WI）上相对于脑干呈等信号（36%）或略低信号（64%）；62%表现为强化明显且均匀；71%的肿瘤形状为圆形或椭圆形；80%的肿瘤以/或位于内耳道（IAC）。小型听神经瘤大多呈圆形或椭圆形，Gd增强前后信号强度（SI）均匀。较大的听神经瘤在形态和SI上更不均匀。讨论了这些及其他征象的意义、早期诊断和鉴别诊断。
