The best test for an AVM (arteriovenous malformation) is an angiography. This test uses a contrast dye to create a detailed image of the blood vessels in and around the AVM. It allows the radiologist to see the exact size and shape of the AVM, as well as any associated aneurysms or other abnormal blood vessels. This diagnostic tool is especially important for patients who are candidates for a surgical procedure, as it can provide detailed information about the exact location and size of the AVM, which can help the surgeon plan the procedure more accurately. Additionally, angiography provides information about the flow of blood through the AVM, which can help the doctor assess the potential risks to the patient during and after the surgery.
Other tests used to diagnose AVMs can include CT scans, MRI scans, and ultrasound. However, these tests do not provide the same detailed images as an angiography, and are generally not as accurate for diagnosing AVMs.