Diffusion-Weighted MRI Over Standard MRI for Differential Diagnosis between Mucopyocele and Mucoceles

Area of Science:

• Radiology
• Medical Imaging
• Otolaryngology

Background:

• Mucopyocele and mucocele are common paranasal sinus pathologies.
• Accurate differentiation is essential for appropriate management.
• Conventional MRI findings can be ambiguous.

Purpose of the Study:

• To evaluate the diagnostic accuracy of conventional and diffusion-weighted MRI (DWI) for differentiating mucopyocele from mucocele.
• To compare the effectiveness of DWI with conventional MRI sequences.

Main Methods:

• Retrospective analysis of 74 paranasal sinus MRI scans (March 2017 - February 2024).
• Assessment of T1/T2 signal intensities, diffusion restriction, penumbra sign, double rim sign, and parietal micro-abscesses.
• Quantitative apparent diffusion coefficient (ADC) values were recorded.

Main Results:

• Mucopyocele (n=43) vs. Mucocele (n=31).
• T1 hypersignal differed significantly (p=0.02), more common in mucoceles.
• All mucopyoceles showed diffusion restriction (ADC < 0.78 × 10⁻³ mm²/s).
• Double rim sign and parietal micro-abscesses had high specificity but limited location.

Conclusions:

• Diffusion-weighted imaging (DWI) is the most valuable MRI technique for distinguishing mucopyocele from mucocele.
• DWI's ability to detect diffusion restriction is key in differentiating these sinus pathologies.