Quantitative diffusion-weighted magnetic resonance imaging in the evaluation of parotid gland masses: A study with histopathological correlation

摘要

We evaluated the quantitative diffusion-weighted magnetic resonance imaging (DW-MRI) for parotid masses. Seventy-five patients with 81 focal parotid masses were included. Following DW-MRI, 73 masses underwent surgical biopsy/resection, 6 underwent ultrasonography-guided fine-needle aspiration, and 2 underwent both procedures. The mean apparent diffusion coefficient (ADC) of benign tumors (n=49, 1.72×10-3 mm2/s) was higher than that of malignant tumors (n=32, 1.05×10-3 mm2/s) (P.001). ADC was 2.15×10-3 mm2/s for pleomorphic adenomas, which was higher than that for other tumors (P.001 for all). ADC cutoff was 1.315 for distinguishing between pleomorphic adenomas and others including malignant tumors. Therefore, DW-MRI may be useful for distinguishing between pleomorphic adenomas and other parotid masses.