Fig 1.

A, Pretreatment anteroposterior DSA projection of right LSA injection in the delayed arterial phase demonstrates a right distal LSA aneurysm, retrograde filling of a right posterior frontal MCA branch collateral (curved arrow) from the LSA aneurysm, and faint basal ganglia blush (straight arrow). The patient had left facial palsy and worsening left upper extremity weakness following administration of Amytal. B, Anteroposterior projection with the catheter positioned more distally in the LSA demonstrates no basal ganglia blush in late arterial phase. Amytal administration revealed no resultant neurologic deficit.