FIG. 1.

MRI of the brain before surgery (A–F), immediately after surgery (G–L), and at 8-month follow-up appointment (M–R). White arrows point to imaging evidence of the subdural empyema, and red arrows show infected fluid collection in the right frontal sinus. Right-sided diffusion-restricted fluid collection, visible on presentation (E and F), is substantially improved postoperatively (K and L) and is absent on follow-up imaging (Q and R). T1+ = T1-weighted sequence with gadolinium contrast; T2-W = T2-weighted sequence; DWI = diffusion-weighted imaging sequence.