Article Figures & Data
Figures
- Fig. 1.
A 63-year-old man with an unruptured 6-mm AcomA complex aneurysm. The patient underwent endovascular embolization for the aneurysm with the guiding catheter in the left ICA. The aneurysm was coiled with balloon assistance. The total volume of contrast medium injected was approximately 300 mL. A, DSA after embolization reveals coil mesh in the left A1-A2 bifurcation (black arrow). B, CBCT immediately after the procedure shows focal subarachnoid hyperattenuation in the left superior frontal sulcus (white arrow). C, Conventional CT 45 minutes after the procedure also shows focal subarachnoid hyperattenuation in the left superior frontal sulcus (white arrow). D, DWI reveals no abnormal high-intensity area indicating acute infarction. E, FLAIR imaging shows no high signal intensity in the sulci indicating SAH. F, T2*-weighted imaging demonstrates no low signal intensity in the sulci indicating SAH. These MR images were obtained 111 minutes after the procedure.
- Fig. 2.
A 42-year-old woman with an unruptured 7-mm AcomA aneurysm. The patient underwent endovascular embolization for the aneurysm with the guiding catheter in the left ICA. The aneurysm was coiled with balloon assistance. The total volume of contrast medium injected was approximately 250 mL. A, Postembolization DSA of the left ICA injection reveals coil mesh in the AcomA region (black arrow). Notice that the bilateral distal ACA is symmetrically visualized, presumably due to the hypoplastic right A1 segment. B and C, Axial and coronal CBCT scans, respectively, immediately after the procedure show focal subarachnoid hyperattenuation in the bilateral superior frontal sulci (black arrows). D, DWI reveals no abnormal high-intensity area indicating acute infarction. E, FLAIR imaging shows no high signal intensity in the sulci indicating SAH. F, T2*-weighted imaging demonstrates no low signal intensity in the sulci indicating SAH. These MR images were obtained 2 days after the procedure.
Tables
Relationship between each parameter and subarachnoid hyperattenuation on FPD-based CBCT immediately after coil embolization
Parameter Subarachnoid Hyperattenuation P Value + − Location of aneurysm ICA 4 19 .0728 MCA 0 2 AcomA 3 3 ACA 2 0 VB 0 3 Size of aneurysm (mm) <5 0 12 <.05 5–10 4 13 10–15 1 0 ≥15 4 2 Amount of contrast medium (mL) <150 0 17 <.001 150–250 4 8 ≥250 5 2 Balloon assistance Performed 3 12 .567 Not performed 6 15 Stent assistance Performed 4 5 .150 Not performed 5 22 Note:—+ indicates presence; −, absence.
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