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.