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- Title
Effectiveness of anatomic criteria for predicting parotid tumour location.
- Authors
Kim, J.Y.; Yang, H.C.; Lee, S.; Kim, H.C.; Shin, D.J.; Cho, Y.B.; Cho, H.‐H.
- Abstract
Objective We evaluated the accuracy, positive predictive value ( PPV), negative predictive value ( NPV), specificity and sensitivity of eight anatomic landmarks to differentiate parotid deep lobe tumours from superficial lobe tumours: the lateral margin of the retromandibular vein ( RMV), a straight line from the facial nerve trunk ( FN trunk) to the mandibular ramus ( FN line), a straight line from the FN trunk to the RMV ( tRMV), a straight line from the FN trunk to the lateral margin of the masseter ( tMasseter), a straight line from the ipsilateral vertebral posterior end to the RMV (U-line), an arc with a radius of 8.5 mm centred on the mandibular ramus (Conn's arc), a straight line from the lateral surface of the masseter muscle to the lateral margin of the RMV ( rMasseter) and an angle from the FN line, tumour and the lateral margin of the masseter muscle ( FTM angle). Methods A total of 181 patients with a parotid gland tumour who underwent parotidectomy at a tertiary hospital were identified retrospectively from May 2005 to May 2013. Pre-operative computed tomography and intraoperative findings were compared to evaluate each landmark. Results rMasseter (accuracy: 85.5%, PPV: 90.0%, NPV: 85.12%, specificity: 98.1%, sensitivity: 22.2%) and tMasseter (accuracy: 86.3%, PPV: 80.0%, NPV: 87.1%, specificity: 97.1%, sensitivity: 44.4%) showed superior results as diagnostic criteria. Conclusion rMasseter and tMasseter were useful as anatomic landmarks to differentiate a parotid deep lobe tumour from a superficial lobe tumour.
- Subjects
PAROTID gland tumors; MANDIBULAR ramus; MASSETER muscle; COMPUTED tomography; PAROTIDECTOMY; PATIENTS
- Publication
Clinical Otolaryngology, 2016, Vol 41, Issue 2, p154
- ISSN
1749-4478
- Publication type
Article
- DOI
10.1111/coa.12491