Revascularization of chronic vertebrobasilar occlusions is technically feasible. Due to the high-risk nature, it should be reserved as an option only for selected group of patients with recurrent ischemic symptoms and progressive disability despite maximal medical therapy. Further prospective study is helpful to clarify the role of this intervention. “
“The azygous anterior cerebral artery (Az) is a rarely observed anomaly of the anterior cerebral artery, and its associated aneurysm is even rarer. Our aim was to evaluate 3-dimensional

time-of-flight magnetic resonance angiography (3-D-TOF MRA) in the diagnosis of Az and associated aneurysms. Three thousand five hundred seventy-two this website consecutive patients underwent 3-D-TOF MRA at 3.0 T. Postprocessing techniques, including volume rendering (VR) and single artery highlighting, were performed by a 3-D specialist. All MRA data and clinical information were recorded and stored in a database for further analysis. Fourteen patients (.39%) were identified as having an Az. Among these cases, 3 males (21.43%) had an aneurysm located at the distal bifurcation

of the Az, with a mean size of 9.43 ± 3.33 mm. In MRA, the common trunk of the Az was slightly larger in diameter than the A1 segment (2.62 ± .35 mm vs. 2.54 ± .35 mm; P = .008). With the VR technique, 3-D-TOF MRA is feasible and valuable in detecting an Az and associated aneurysm. Our MRA-based study has proved that the Az is a rare anomaly but has a relatively high incidence of associated aneurysms. The azygous anterior cerebral artery (Az) is comprised of a single common trunk of the distal anterior cerebral learn more artery (ACA) fused with two sides of the proximal ACA.[1-4] The reported incidence of Az in the literature ranges from 0 to 5%, representing a relatively uncommon developmental anomaly of the circle of Willis in man.[1-4] The Az should be identified from other anomalies of the ACA, including bihemispheric ACA and triplicate ACA in angiography.[1] Digital subtraction (DS) angiographic distinction between the Az and

the bihemispheric ACA is difficult because the hypoplastic see more A2 segment in the bihemispheric ACA is often poorly visualized and the pattern of DS angiography (based on one-artery angiography at a time) cannot visualize the whole cerebral artery network in one scanning series.[1] For Az, unilateral DS angiography need contralateral carotid compression. With gross visualization of all cerebral arteries, magnetic resonance angiography (MRA) can overcome the inherent disadvantage of DS angiography, especially with the aid of post-processing techniques, including volume rendering (VR). Thus, MRA may be more useful in the detection of an Az and associated aneurysms. The presence of an Az is closely related to aneurysm formation and is often associated with other anomalies of the central nervous system.