An intranidal aneurysm is an Aneurysm located within the nidus of an AVM. The presence of an intranidal aneurysm increases the hemorrhage risk of an AVM[^1].
Imaging
The gold standard for assessing an AVM and an associated intranidal aneurysm is digital subtraction angiography (DSA). Characteristically, an intranidal aneurysm fills early during DSA[^1].
AVM on DSA with an intranidal aneurysm.
Angiography of an arteriovenous malformation with an associated intranidal aneurysm.