Has anyone ever had a Cerebral Angiogram?

Can anyone read my father's MRI-Angiogram report and put it in layman's terms?

• MRI Angiogram without contrast: Findings: There is nonvisualization of the right posterior cerebral, right and left vertebral arteries, basilar on the left. The posterior cerebral are seen. There is narrowing of the midportion of the left posterior cerebral. The distal posterior cerebral is noted. Posterior communicating arteries are not visualized. Bilateral internal carotid arteries are seen and their bifurcations into the anterior cerebral. Anterior communicating artery is seen without evidence of aneurysmal dilation. The right middle cerebral artery beyond the M1 segment is not visualized probably due to low signal. There is diffuse narrowing in the left middle cerebral artery beyond the M1 segment. Impression: High-grade stenosis, occlusion or limited signal from the right middle cerebral artery beyond the M1 segment and with nonvisualization of the right posterior cerebral artery. Diffuse moderate plaquing in the left middle cerebral artery beyond the M1 segment. I would appreciate any insight someone can give. I saw a similar request on Ask.com and so thought I might also receive a response.

• Answer:

  Your father has cerebrovascular disease. You can read up on the "Circle of Willis" to get an idea about the anatomy of these vessels and the regions of the brain they perfuse. The Vertebral arteries (in the bones of the neck) combine into a single Basilar artery which branches into the Posterior Cerebral Artery. The Internal Carotid Arteries feed into the Middle Cerebral Arteries which quickly give rise the Anterior Cerebral Arteries. All of these Cerebral Arteries are ultimately connected to each other near their originations via Anterior and Posterior Communicating Arteries in normal circumstances.The stenosis that is mentioned means a narrowing of the internal diameter of the vessels. The plaquing refers to atherosclerotic disease inside the vessels caused by cholesterol and calcium deposits in the vessels.