Facial nerve MRI is a clinical challenge that it is difficult to differentiate parotid gland tumors from facial nerve on conventional imaging. It is great demand to develop new diagnostic technology to accurately display peripheral nerve and tumor for avoiding intraoperative injury. In this study, 3 dimension fast field echo imaging(T2WI-3D-FFE) is potentially a valuable sequence in displaying the intraparotid facial nerve and localizing the tumor.
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