TABLE 3:

Possible errors with the reference standard modality, DSA

Patient No.	Occlusion Location at DSA	Stenosis Location at CTA	Probable DSA Error
3	Vertebral	Vertebral	False-positive
4	Vertebral	Vertebral	False-positive
20	Basilar	Basilar	False-positive
22	Basilar	Basilar	False-positive
24	Basilar	Basilar	False-positive
28	Basilar	Basilar	False-positive