The pre-treatment image shows vasospasm involving the left M1 and A1 segments.
An endovascular balloon catheter has been passed through a guiding catheter in the left ICA and directed into the left M1 segment over a micro guide wire. The two markers indicate the proximal and distal extent of the balloon (white arrows). The balloon has been inflated in the middle cerebral artery (black arrows).
After angioplasty the left MCA is of normal calibre. Left hemisphere perfusion is significantly improved.