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Keywords:
Ear / Nose / Throat, Head and neck, Salivary glands, MR-Diffusion/Perfusion, Surgery, Comparative studies, Cancer, Multidisciplinary cancer care
Authors:
K. Markiet, B. Mikaszewski, A. Smugala, D. Stodulski, B. Kowalska, C. Stankiewicz, E. Szurowska; Gdansk/PL
DOI:
10.1594/ecr2015/B-0154
Purpose
Parotid gland tumors account for approximately 3% of all head and neck tumors and are most frequently benign [1].
The majority of cases,
however,
require surgical treatment - local excision or superficial parotidectomy in case of benign lesions and total parotidectomy with potential sacrifice of the facial nerve in malignant lesions [2].
Clinical findings are often of limited value with only a few symptoms indicating malignancy,
one of them being facial nerve palsy.
Typically,
the pathologic diagnosis is determined by the way of fine needle aspiration cytology (FNAC).
FNAC is a well-recognized and valuable adjunct to preoperative assessment of parotid masses,
however,
it does not always prove conclusive,
especially in case of insufficient material from a small or deep lesion [3-5].
Thus,
preoperative imaging evaluation plays a vital role in surgical planning,
especially in assessment of location,
perineural spread and/or deep space infiltration.
The use of magnetic resonance imaging (MRI) with conventional sequences is well established in detecting parotid gland tumors and combined with analysis of diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC) maps as well as dynamic contrast-enhanced imaging (DCE-MRI) allows to differentiate various types of parotid tumors (e.g.
pleomorphic adenoma,
Warthin tumor and malignant tumors) [6].
The aim of the study was to assess the value of DWI and DCE-MRI in common parotid gland tumors in correlation with FNAC and histopathological examination results.