Press G A, Hesselink J R
Department of Radiology, University of California, San Diego 92103-1990.
AJR Am J Roentgenol. 1988 Jun;150(6):1371-81. doi: 10.2214/ajr.150.6.1371.
The high-field, thin-section (3-5 mm) MR imaging characteristics of 49 cerebellopontine angle and internal auditory canal lesions were reviewed. The diverse abnormalities include 20 acoustic neurinomas, eight neurinomas of other cranial nerves (six involving the fifth cranial nerve and two involving cranial nerves IX-XI), seven meningiomas, five subdural fluid collections, four brainstem tumors with exophytic components, three glomus jugulare tumors, one epidermoid tumor, and one basilar artery aneurysm. T1-, T2-, and proton-density-weighted images were obtained in all cases. T1-weighted images most accurately showed the margins of the seventh and eighth nerves in the internal auditory canal and were most sensitive in detecting small tumors in the cerebellopontine angle. Differentiation of meningioma from acoustic neurinoma by MR was provided most reliably by separation of the meningioma from the porus acusticus and seventh and eighth nerves and not by signal-intensity differences. A hypointense vascular rim was noted on MR in seven of 13 extracanalicular acoustic tumors and in three of seven meningiomas.
回顾了49例桥小脑角和内耳道病变的高场、薄层（3 - 5毫米）磁共振成像特征。这些不同的异常包括20例听神经瘤、8例其他颅神经神经瘤（6例累及第五颅神经，2例累及第九至第十一颅神经）、7例脑膜瘤、5例硬膜下积液、4例有外生性成分的脑干肿瘤、3例颈静脉球瘤、1例表皮样肿瘤和1例基底动脉瘤。所有病例均获得了T1加权、T2加权和质子密度加权图像。T1加权图像最准确地显示了内耳道内第七和第八神经的边缘，并且在检测桥小脑角的小肿瘤方面最敏感。磁共振成像对脑膜瘤和听神经瘤的鉴别最可靠的依据是脑膜瘤与内耳道孔以及第七和第八神经的分离，而不是信号强度差异。在13例管外听神经肿瘤中的7例以及7例脑膜瘤中的3例磁共振成像上可见低信号血管边缘。
