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Effectiveness of anatomic criteria for predicting parotid tumour location
Author(s) -
Kim J.Y.,
Yang H.C.,
Lee S.,
Kim H.C.,
Shin D.J.,
Cho Y.B.,
Cho H.H.
Publication year - 2016
Publication title -
clinical otolaryngology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.914
H-Index - 68
eISSN - 1749-4486
pISSN - 1749-4478
DOI - 10.1111/coa.12491
Subject(s) - medicine , trunk , anatomy , masseter muscle , parotid gland , lobe , parotidectomy , nuclear medicine , facial nerve , margin (machine learning) , radiology , pathology , ecology , machine learning , biology , computer science
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 ( tM asseter), 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 ( rM asseter) 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 rM asseter (accuracy: 85.5%, PPV : 90.0%, NPV : 85.12%, specificity: 98.1%, sensitivity: 22.2%) and tM asseter (accuracy: 86.3%, PPV : 80.0%, NPV : 87.1%, specificity: 97.1%, sensitivity: 44.4%) showed superior results as diagnostic criteria. Conclusion rM asseter and tM asseter were useful as anatomic landmarks to differentiate a parotid deep lobe tumour from a superficial lobe tumour.