MRI images of a 45-year-old male patient with nasopharyngeal cancer and mastoiditis in the left ear.

<p>(a) Axial T2W image; (b) T1W contrast-enhanced image with fat saturation; (c) DWI (<i>b</i> = 1000). Fluid accumulation with peripheral contrast enhancement and restricted diffusion is observed in the left mastoid (white arrow); the right mastoid appears normal.