Admission CT and DSA. CT = computed tomography and DSA = digital subtraction angiogram. (A) Axial uninfused CT of the brain at the level of the mesencephalon displaying thick subarachnoid clot in the basal cisterns. (B) Axial uninfused CT of the brain at the level of the lateral ventricles displaying hydrocephalus, a small left acute subdural hematoma and diffuse SAH. (C) Lateral projection of left internal carotid artery injection via DSA displaying a small anterior choroidal artery aneurysm (black arrow). (D) Three-dimensional reconstruction of DSA displaying anterior choroidal artery aneurysm on the inferior portion of the supraclinoid internal carotid artery.