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Table 6: Retrospective evaluation of 11 aneurysms not detected with CTA-MMBE*
Aneurysm Location Size (mm) Visible in Retrospect on CTA Main Reason for Missing Aneurysm
Ophthalmic artery 2.5 Yes Very small, in direct contact with bony structure (anterior clinoid process) and evaluated as irregularity of the ICA
ICA cavernous segment 2.0 Yes Very small and poor quality of CTA
ICA supraclinoid segment 2.0 Yes Very small and evaluated as part of multilobulated aneurysm
ICA tip 1.8 No Very small and poor quality of CTA
ICA tip 2.2 Yes Very small
MCA 1.5 No Very small and presence of vasospasm
MCA 2.0 Yes Very small and only visible on 1 MIP image
MCA 1.6 Yes Very small and evaluated as thickening of MCA bifurcation
Pericallosal artery 2.0 Yes Very small
PICA 4.0 Yes Dissecting aneurysm, vasospasm, and incomplete bone removal due to patient movement
PcomA 2.0 No Very small and low arterial contrast
* All except 1 were <3 mm. One 4-mm aneurysm was undetected due to poor-quality CTA-MMBE.