Non-invasive testing includes duplex ultrasonography, magnetic resonance angiography (MRA), and computed tomography angiography (CTA).[1] Invasive testing through angiography is the gold standard. However, due to the higher risk of complications this is typically not done early on. Occasionally, FMD is diagnosed asymptomatically after an unrelated x-ray presents the classic ‘string of beads’ appearance of the arteries, or when a practitioner investigates an unexpected bruit found during an exam.