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本文分析手术和病理证实76例78个听神经瘤的MRI表现,其中2例为内听道内微小听神经瘤,11例作静脉注射Gd-DTPA后MRI成象。下列特征有助于听神经瘤诊断:(1)肿瘤以第Ⅶ、Ⅷ神经束为中心生长,病侧Ⅶ、Ⅷ神经束明显增粗,与肿瘤无明确分界;(2)T_1加权图象肿瘤呈低信号或低等混合信号,T_2加权图象呈高信号或高等混合信号。静脉注射Gd-DTPA对诊断微小听神经瘤常甚有效。
In this paper, MRI findings of 76 acoustic neuromas in 76 patients confirmed by surgery and pathology were analyzed. Among them, 2 were intraocular small acoustic neuromas and 11 were imaged by Gd-DTPA intravenous MRI. The following features contribute to the diagnosis of acoustic neuroma: (1) the tumors grow on the Ⅶ and Ⅷ nerve bundles, the thickening of the Ⅶ and Ⅷ nerve bundles on the diseased side, with no obvious demarcation from the tumor; (2) Low-signal or low-level mixed signal, T_2 weighted image was high or high mixed signal. Intravenous Gd-DTPA is often effective in the diagnosis of small acoustic neuroma.