Posterior circulation: No flow-limiting stenosis, aneurysm, or definite vascular malformation is identified.
Dural venous sinuses: Patent.
Additional comment: None.
1. Interval increase in size of the large left parietal intraparenchymal hematoma now extending to the right cerebral hemisphere across the corpus callosum, with increasing surrounding edema, mass effect, worsening midline shift, new uncal and downward
transtentorial herniation. Stable to slight increase in subdural extension.
2. No definite vascular malformation identified to account for hemorrhage although a micro-AVM or pseudoaneurysm compressed by the
large hematoma is difficult to exclude at this time. Of note, a loop of a distal branch of the right pericallosal artery courses along the
medial aspect of the hematoma. However, no active contrast extravasation is seen in this region on delayed postcontrast images to suggest that this is the responsible bleeding artery. Consider further evaluation with MRI and/or DSA.