Article Figures & Data
Figures
- Fig 1.
Segmental pattern and descending course of circumferential pontine arteries (arrows) on volume rendering reconstructions of a DynaCT dataset of the basilar artery in Towne and lateral projection.
- Fig 2.
Another case shows a less regular pial network pattern (*) with connections (arrow) between adjacent arteries that are better demonstrated on DynaCT reconstructions (A), than on high resolution DSA with 2k matrix (B).
- Fig 3.
Axial cuts of DynaCT dataset with thin sections of 3 mm reconstructed from 3D rotational angiogram shows ventral pontine perforators (bright arrows) originating from the basilar artery (*) at the junction between mesencephalon and pons (A), at the midpontine level (B), and at the vertebrobasilar junction (C).
- Fig 4.
A, Volume rendering reconstructions of 3D rotational angiogram show a segmental pattern with several circumferential pontine arteries on the right side (arrowheads) and a dominant AICA (ellipse) and less other pontine branches on the left side in a patient with a midbasilar stenosis (*). B, Note the descending course and a small local collateral (arrow) bridging the stenosis (*) in MPR of DynaCT datasets in volume rendering technique (VRT) from the same 3DRA study.
- Fig 5.
Volume rendering reconstruction (A) and parasaggital cut of a DynaCT dataset (B) show multiple hypertrophied circumferential pontine arteries (arrows) involved as feeders in the supply of a mesencephalic AVM (*). Compared with the volume rendering reconstructions A and B, 2k DSA images of the same patient in standard projections, C and D, show fewer circumferential arteries (arrows) and those that are displayed are less well visualized.
Tables
Basic patterns of the small side branches of the basilar artery in 2k DSA and 3DRA imaging studies
Number of Segmental Arteries Right Number of Segmental Arteries Left Direct Pontine Perforators Collateralsa Common Trunks of Circumferential Arteries Pial Network 0–3 4–7 8–10 0–3 4–7 8–10 Caudal Medial Rostral 2k DSA 10 7 3 5 11 4 0 0 0 6 8 1 3DRA 6 13 1 5 13 2 20 20 20 11 10 6 ↵a Collaterals are defined as small anastomosis with a descending course connecting 2 adjacent circumferential arteries.
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