Fig. 3.

MRI after initial surgery. A, B: MRI the day after surgery (A: upper: FLAIR, lower: DWI, B: Gd-T₁WI). Subdural empyema along the occipital falx and cerebellar tentorium was well removed, but empyema along the frontal falx remained. C, D: MRI on the 6th day postoperatively (C: upper: FLAIR, lower: DWI, D: Gd-T₁WI). Empyema in the frontal to parietal parafalcine area had increased. DWI: diffusion-weighted image, FLAIR: fluid attenuated inversion recovery, Gd-T₁WI: gadolinium-enhanced T₁-weighted image, MRI: magnetic resonance imaging.