Assessment criteria for vessel type seen during intravascular injection
| Score | Vessel | Suggestive Features |
|---|---|---|
| 5 | Definite vein | Flow into a specific, anatomically identifiable venous structure |
| 4 | Probable vein | Flow into region of known venous structure, flow predominantly away from spinal canal, delayed washout |
| 3 | Indeterminate | Not meeting criteria for other categories |
| 2 | Probable artery | Flow into region of known arterial structure, flow predominantly toward the spinal canal, rapid washout |
| 1 | Definite artery | Flow into a specific, anatomically identifiable arterial structure |