Motor denervation of tumors of the head and neck: changes in MR appearance.
Motor denervation of tumors of the head and neck: changes in MR appearance.
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DOI：
10.2463/mrms.1.157
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发表时间：
2002-11-01
期刊：
影响因子：
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通讯作者：
Watarai, Jiro
中科院分区：
文献类型：
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作者：
Kato, Koki;Tomura, Noriaki;Watarai, Jiro
目得：我们回顾性分析了三叉神经（V3）和舌下神经第三（下颌）分支运动神经支配的MR表现。方法：对6例头颈部肿瘤的运动神经支配进行了回顾性分析。其中包括2例V3去神经患者，3例舌下神经去神经患者，1例V3和舌下神经去神经患者。发病后观察6 ~ 44个月。在失神经支配的肌肉中，在T1和T2加权图像中信号强度的变化，对比度增强的程度，以及肌肉的体积在随访期间进行了估计。结果：在所有V3失神经支配的病例中，肌肉在发病后3个月内在T1加权图像中的信号强度没有变化。在两例舌下神经切除的病例中，在最初的三个月内，舌头在T1加权像上出现同侧高信号。在1例V3去神经和2例舌下神经去神经的病例中，发病后3个月，去神经肌肉在T2加权像上出现高信号。失神经支配3个月后，所有失运动神经支配区域的信号强度在T（1）和T（2）加权图像上均增加。在前三个月内获得的增强后T1加权图像显示所有失神经肌肉的对比度增强。在V3去神经的三个病例中，受影响肌肉的体积在前三个月后减少。3例舌下神经失神经病变患者，发病后3个月，患侧舌体积明显减小.结论：发病后3个月，失神经肌肉在T2加权像上呈高信号，增强后T1加权像上呈增强，脂肪浸润和体积减少明显.熟悉头颈部肿瘤伴发的失神经支配肌肉的MR表现是很重要的，以避免与炎性或肿瘤性病变混淆。
PURPOSE: We reviewed the MR appearance of motor denervation of the third (mandibular) division of the trigeminal nerve (V3) and of the hypoglossal nerve.METHOD: Six cases of tumor of the head and neck with motor denervation were retrospectively evaluated. These comprised two patients with V3 denervation, three patients with hypoglossal nerve denervation, and one patient with both V3 and hypoglossal denervation. The observation was conducted for 6 to 44 months after onset. In denervated muscles, changes in signal intensity in T(1)- and T(2)-weighted images, degree of contrast enhancement, and volume of muscle were estimated during the follow-up period.RESULTS: In all cases of V3 denervation, the muscles showed no change in signal intensity in the T(1)-weighted images up to three months after onset. In two cases of hypoglossal denervation, the tongues appeared ipsilaterally hyperintense in the T(1)-weighted images within the first three months. In one case with V3 denervation and two cases with hypoglossal denervation, denervated muscles appeared hyperintense in the T(2)-weighted images up to three months after onset. At three months after denervation, the signal intensities of all motor-denervated areas increased in both T(1)- and T(2)-weighted images. Postcontrast T(1)-weighted images obtained within the first three months displayed contrast enhancement of all denervated muscles. In three cases of V3 denervation, the volumes of the affected muscles were reduced after the first three months. In three cases of hypoglossal denervation, the ipsilateral volume of the tongue decreased at three months after onset.CONCLUSION: Up to three months after onset, the denervated muscles appeared hyperintense in the T(2)-weighted images and contrast enhancement in postcontrast T(1)-weighted images before fatty infiltration and volume loss were apparent. Familiarity with the MR appearance of denervated muscles accompanying tumors of the head and neck is important to avoid confusion with inflammatory or neoplastic processes.