Multiparametric magnetic resonance imaging in differentiating benign and malignant sinonasal masses: A prospective study and literature review

Figure 4 A 42-year-old male with inflammatory polyp of the left maxillary sinus. A: Axial T2-weighted image (T2WI) shows a heterogeneous signal intensity mass epicentered in the left maxillary sinus with widening of the osteomeatal complex; B: High b-value (b = 1000 seconds/mm²) image does not show any areas of high signal intensity; C: On corresponding apparent diffusion coefficient (ADC) map, no true diffusion restriction was seen (mean ADC value of 1.89 × 10^-3 mm²/second); D: Axial post contrast T1WI image shows lobular pattern of enhancement; E: High b-value image (b = 2000 seconds/mm²) of intravoxel incoherent motion imaging diffusion kurtosis imaging sequence with region of interest (ROI) drawn (arrow) over the mass after correlating with the post contrast images; F: True diffusion coefficient (Dt) map after drawing ROI showed value of 0.76 × 10^-3 mm²/second.