Ventricles and extra-axial spaces: No ventricular, sulcal, or cisternal effacement.
Visualized paranasal sinuses: Moderate mucosal thickening of the left maxillary and lesser extent right maxillary sinus.
Mastoid air cells: Clear.
Additional comment: None.
Anterior circulation: Branches from both the left anterior cerebral artery and left middle cerebral artery course into the venous malformation. 2 mm posterior outpouching of the cavernous right internal carotid artery which may represent an infundibulum or small aneurysm. No flow-limiting stenosis.
Posterior circulation: No flow-limiting stenosis or aneurysm. Fetal-type left posterior cerebral artery. The circle of Willis is complete. The basilar artery is diminutive.