Image 1. This is a brain CAT scan image. The yellow arrows point to two aneurysms.

Image 2. This is also a brain CAT scan image. The yellow arrow points to a ruptured giant brain aneurysm with some clot (thrombus) within the main aneurysmal sac. The green arrow heads point to blood in the subarachnoid space. This image therefore shows aneurysmal subarachnoid hemorrhage (SAH).

Image 3. This is a brain magnetic resonance angiogram (MRA). The image is a "scout" image of the Circle of Willis at the base of the brain. The yellow arrows point to 6 different brain aneurysms.

Image 4. This is a formal cerebral angiogram image. This particular projection shows part of the roadmap of the brain arteries, and happens to also show multiple brain aneurysms (yellow arrows). One of the aneurysms has an irregular "daughter sac" (DS) coming off its dome.

Image 5. This shows a pair of intraoperative photographs. The photograph on the left shows an aneurysm (circled by a dotted line), with a daughter sac (smaller solid circle). It is the same daughter sac-bearing aneurysm shown in Image 4. In the photograph on the right, an aneurysm clip (black arrow) is being deployed around the neck of the aneurysm to completely obliterate the aneurysm. In both of these images, the yellow arrow points to the parent artery from which the aneurysm arose, and the green arrowhead points to a branch coming off the vessel a short distance from (i.e., distal to) the aneurysm's neck.

Image 6. This a cerebral angiogram of the posterior circulation showing a basilar artery apex (or basilar caput) aneurysm (green arrowhead)

Image 7. The same aneurysm shown in Image 6 has now undergone endovascular coiling. The arrow head points to the coiled aneurysm, packed with ultrafine aneurysm coils. This aneurysm has been completely obliterated by the coiling procedure.