The Denver grading scale can be used to categorize a blunt injury to a cerebral vessel based on its severity. The authors are from the University of Colorado in Denver.
Parameters:
(1) luminal change
(2) pseudoaneurysm
(3) transection
Luminal Change
Pseudoaneurysm
Transection
Grade
smooth vessel wall with no luminal narrowing
absent
absent
0
irregularity in vessel wall or 1 - 24% luminal narrowing
absent
absent
I
raised intimal flap or 25 - 99% luminal narrowing
absent
absent
II
NA
present
absent
III
100% occlusion
NA
absent
IV
NA
NA
present
V
where:
• Changes to the vessel wall may include dissection or intramural hematoma.
• Transection of a vessel is associated with extravasation of dye during angiography.
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