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頁籤選單縮合
題名 | Visualization of Facial Nerve in the Parotid Gland using Sonography: a Preliminary Observation=以超音波對腮腺中顏面神經的初步觀測 |
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作 者 | 吳志修; 施景中; 黃威雄; 謝豐舟; | 書刊名 | Journal of Medical Ultrasound |
卷期 | 6:4 1998.12[民87.12] |
頁次 | 頁165-168 |
分類號 | 415.81 |
關鍵詞 | 超音波; 腮腺; 顏面神經; Facial nerve; Parotid tumor; Sonography; |
語文 | 英文(English) |
英文摘要 | Background: Imaging of the surgically significant intraparotid facial nerve has been the aspiration of many radiologists and head and neck surgeons. Ultrasonography has long been considered incapable of demonstrating the facial nerve, possibly because of the similarity of echogenicity or the attenuation of the ultrasonic beam by parotid parenchyma. In this study, we demonstrate the possibility of visualizing the facial nerve trunk through a window provided by a hypoechoic overlying tumor. Materials and Methods: Twelve patients with an infra-auricular mass scheduled for superficial parotidectomy were examined with a 5-10-MHz, broad-band, lineararry sonographic transducer. The main trunk of the facial nerve behind the shadow of the superficial tumor was carefully inspected with the probe held along the parasagittal plane of the head and insonating obliquely behind the ramus of the mandible. The finding was justified using power Doppler sonography to rule out the possibility a vascular shadow and with air-sialography to rule out an excretory duct. Results: Sonographic shadows of the cross section of a tubular structure were demonstrated in nine cases with superficially located tumors. Surgical correlation indicated identical locations of these sonographic shadows and the facial nerve tract. No vascular signal was detected inside these tubular shadows with power Doppler sonography, and no change of echogenicity was found after filing of the excretory duct system with air in a test case. Conclusion: Utilizing the hypoeschoic 'through transmission window' of some hypoechoic superficial tumors, we could clearly define the relationship between the facial nerve trunk and the tumor. |
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