Preoperative Prediction of the Location of Parotid Gland Tumors using Anatomical Landmarks |
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Authors: | Chi Young Lim Hang-Seok Chang Kee-Hyun Nam Woong Youn Chung Cheong Soo Park |
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Institution: | Department of Surgery, National Health Insurance Corporation Ilsan Hospital, Gyeonggi-do, Korea, sur@hanmail.net. |
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Abstract: | BACKGROUND: The location of the parotid gland tumor can affect the duration and difficulty of operation. Therefore, accurate preoperative evaluation of tumor location can affect surgical outcomes. METHODS: Results in 100 patients with parotid gland tumors who underwent parotidectomy between January 2000 and October 2005 were retrospectively reviewed. Tumor location was determined relative to four landmarks-facial nerve (FN) line, Utrecht (U) line, Conn's arc (CA), and retromandibular vein (RV)-on computerized tomography (CT) scans, and confirmed by intraoperative findings. The accuracy of each landmark was evaluated. Correlations between accuracy and tumor size were determined for tumors =2 cm and >2 cm in diameter. RESULTS: Of the four landmarks, the U line was the most accurate (94%), sensitive (89.3%), and specific (97.7%) in predicting tumor location. However, for tumors =2 cm in diameter, FN line (p = 0.022) and RV (p = 0.028) were significantly more accurate than U line and CA. CONCLUSION: Although the U line was the most accurate in predicting the location of parotid gland tumors, landmarks predicting accurate tumor location should be selected according to tumor size. |
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