Presentation
Thunderclap headache
Patient Data
Acute 18 x 43 x 21 mm left occipital lobe intraparenchymal hemorrhage with intraventricular extension into both occipital horns and subdural extension along the falx and tentorium. There is also subarachnoid blood present in the left pre pontine, interpeduncular, left cerebellopontine angle and ambient cisterns.
Circle of Willis CT angiogram confirms the presence of a left occipital arteriovenous malformation at the posteromedial aspect of the hematoma. The malformation is fed by a mildly enlarged left posterior cerebral artery and drains via a dilated vein of Galen into the straight sinus.
Case Discussion
An example of acute lobar hemorrhage due to cerebral arteriovenous malformation. This case emphasizes the importance of performing post contrast imaging in the setting of lobar hemorrhage to assess for an underlying mass or arteriovenous malformation. In elderly patients with known cerebral amyloid angiopathy post contrast imaging can probably be avoided.