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A tortuous artery is one that has frequent twists and turns in a short period of time. An aneurysm is a dilated segment of the artery that also has a weakened wall as it gets larger, so is at risk for bleeding. The A2 segment refers to a specific anatomic section of the anterior cerebral artery at the base of the front of the brain. The two anterior cerebral arteries communicate with each other shortly after forming, and the A2 segment is the first segment after this communication.
This test was not able to tell whether this is a tortuous artery or an aneurysm. A tortuous artery is not really a concern whereas an aneurysm can be serious, particularly as it gets larger. The doctor may discuss this with the Radiologist to see if the Radiologist is leaning strongly towards one of the two possible causes. But if the two diagnoses cannot be differentiated, then it may be necessary to perform a better quality angiogram, which will likely involve contrast.
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