Fig. 12
From: Imaging findings of the orbital and intracranial complications of acute bacterial rhinosinusitis
Focal cerebritis: a) Axial CT in bone window showing an opacified right frontal sinus with a bony defect in the posterior sinus wall (arrow). b) ceCT image in a soft tissue window in the same patient showing a focal area of hypodensity in the right frontal lobe (short arrow) with faint enhancement in the centre. In addition, a subdural fluid collection can be seen (long arrow). c) Axial MR FLAIR image of the same patient showing an area of hyperintensity in the left frontal lobe (short arrow). These findings indicate frontal sinusitis with bony erosion causing subdural empyema and focal cerebritis