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Preoperative MRI at the time of presentation. Sagittal T1-weighted postcontrast (A) and coronal T2-weighted (B) MRI demonstrate significant enhancement and edema, involving the frontal, ethmoidal, maxillary, and sphenoid sinuses. Axial diffusion-weighted (C) and coronal T1-weighted postcontrast (D) MRI show a diffusion-restricting and enhancing left frontal subdural collection (arrows), consistent with subdural empyema.
