• **Temporal artery ultrasound (color-coded duplex sonography)**

Color-coded duplex sonography can be utilized to examine the temporal, extracranial, occipital and subclavian arteries. An ultrasound study has a sensitivity of 85% and a specificity of more than 90% [1–4, 14]. The 'halo sign' where Inflammatory oedema of the vascular wall will be shown as hypoechoic wall thickening is characteristic.
