Fig 2. Normal distal ICA. A, Axial CTA image at the level of the left distal ICA (arrow) and distal ECA (both enclosed by dashed-line box). Densely calcified styloid process is between the ICA and the ECA. B, Magnification of the distal ICA and distal ECA with diameter measurements; the distal ICA diameter (A, 0.42 cm) is substantially larger than the distal ECA diameter (B, 0.23 cm). Densely calcified styloid process is between the ICA and the ECA. C, 3D-rendered image of the left distal ICA and distal ECA, showing their normal relationship (arrow, distal ICA).