Radulesco T, et al. - Researchers performed this retrospective study analyzing MRI with morphological (T1, T2) and diffusion sequences (DWI, b1000) in patients presenting non-aggressive patterns of sinus opacity and operated on by Functional Endoscopic Sinus Surgery (FESS). Consecutive patients having undergone FESS in whom MRI of the paranasal sinuses was performed were included and were allocated to Case (pus) or Control (no pus) groups depending on sinus content found intraoperatively. Analysis of T1, T2, b1000 and MRI sequences and ADC map was performed. Multivariate analysis revealed a significant association of MRI with ADC<0.725 x10^-3 mm²/sec and b1000_SI>brain with the Case group. They noted the significant association of MRI with b1000_SI< brain and ADC>1.450x10^-3 mm²/sec with the Control group. These findings revealed that extremely promising results are conferred by diffusion MRI regarding content characterization of infectious sinus diseases.