Malformations Flashcards
1
Q
What is Cognard definitions used for?
A
Dural atriovenous malformations.
2
Q
What is the meaning of Cognard typ 4?
A
Location of fistula:
-Cortical
Presence of cortical venous drainage:
-Yes. drains into cortical veins and not into sinus.
Direction of flow:
Does not need to be addressed for grade IV.
Presence of venous ectasia:
-Yes. Drainage WITH presence of venous ectasia.