Fig. 11
From: Imaging findings of the orbital and intracranial complications of acute bacterial rhinosinusitis
Epidural and subdural empyema: a) ceCT in soft tissue window in a patient with frontal sinusitis (not shown) showing an extra-axial fluid collection passing the midline (short arrow) anterior to the falx cerebri. The adjacent meninges are thickened and show strong enhancement (long arrow). These findings are indicative of an epidural empyema. b) An extra-axial fluid collection in another patient with frontal sinusitis (not shown) running along the falx cerebri instead of passing it anteriorly (short arrow). Again, the meninges are thickened and show increased enhancement (long arrow). These findings indicate subdural empyema