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首页> 外文期刊>Indian Journal of Radiology and Imaging >Diffusion-weighted imaging in extracranial head and neck schwannomas: A distinctive appearance
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Diffusion-weighted imaging in extracranial head and neck schwannomas: A distinctive appearance

机译：颅外头颈部神经鞘瘤的弥散加权成像：独特的外观

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Purpose: To evaluate the diffusion weighted (DW) magnetic resonance imaging (MRI) features of the extracranial schwannomas of head and neck. Materials and Methods: The MRI (including DWI) of 12 patients with pathologically proven head and neck schwannomas (4 men, 8 women, with mean age of 32.6 years; age range 16–50 years) were retrospectively evaluated. Images were analyzed for signal intensity and morphology on conventional sequences followed by the qualitative evaluation of DW images (DWI) and measurement of apparent diffusion coefficient (ADC) values. Results: Majority of the tumors were located in the parapharyngeal space (8/12). All but one showed heterogeneous appearance, with 10 tumors showing scattered areas of hemorrhage. Eight out of 12 tumors showed intensely hyperintense core surrounded by intermediate signal intensity peripheral rim (reverse target sign) on T2-weighted (T2W) images. On DWI, these eight tumors showed a distinctive appearance, resembling target sign on trace DWI and reverse target on ADC map. Out of the remaining four tumors, one showed uniformly restricted diffusion whereas three showed free diffusion. Mean ADC value in the central area of free diffusion was 2.277 × 10?3 mm2/s (range of 1.790 × 10 ?3 to 2.605 × 10?3 mm2/s) whereas in the peripheral area was 1.117 × 10?3 mm2/s (range of 0.656 × 10?3 to 1.701 × 10?3 mm2/s). Rest of the schwannomas showing free diffusion had a mean ADC value of 1.971 × 10?3 mm2/s. Conclusion: Majority of the head and neck schwannomas showed a characteristic appearance of free diffusion in the centre and restricted diffusion in the periphery of the mass.
机译：目的：评估头颈部颅外神经鞘瘤的弥散加权（DW）磁共振成像（MRI）特征。材料和方法：回顾性评估12例经病理证实的头颈部神经鞘瘤的MRI（包括DWI）（男4例，女8例，平均年龄32.6岁;年龄范围16-50岁）。在常规序列上分析图像的信号强度和形态，然后定性评估DW图像（DWI）和测量表观扩散系数（ADC）值。结果：多数肿瘤位于咽旁间隙（8/12）。除一个外，其余所有均显示出异质性，其中10个肿瘤显示出散在的出血区域。在T2加权（T2W）图像上，12个肿瘤中有8个显示出高度高强度的核心，周围是中间信号强度的外围边缘（反向目标信号）。在DWI上，这八个肿瘤表现出独特的外观，类似于痕量DWI上的靶标和ADC图上的反向靶。在其余的四个肿瘤中，一个显示出均匀受限的扩散，而三个显示出自由扩散。自由扩散中心区域的ADC平均值为2.277×10 ？3 mm 2 / s（范围1.790×10？ 3 至2.605×10 ？3 mm 2 / s），而外围区域为1.117×10 ？3 mm 2 / s（范围为0.656×10 ？3 到1.701×10 ？3 mm 2 / s）。其余显示自由扩散的神经鞘瘤的ADC平均值为1.971×10 ？3 mm 2 / s。结论：多数头颈部神经鞘瘤表现出肿块中心自由扩散和肿块周围弥散受限的特征。

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