Improved Microsurgical Creation of Venous Pouch Arterial Bifurcation Aneurysms in Rabbits

American Journal of Neuroradiology

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Fig 1.
Microsurgical steps during venous pouch arterial bifurcation aneurysm creation. A, Suturing sequence at the posterior aspect of the anastomosis: 1) right to left CCA, 2) venous pouch to left CCA, 3) venous pouch to right CCA. B, Suturing sequence at the anterior aspect: 4) right to left CCA, 5) venous pouch to left CCA, 6) venous pouch to right CCA.
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Fig 2.
Morphology of the venous pouch arterial bifurcation aneurysm. A, View under the operation microscope after microsurgery. B, Calibrated DSA 4 weeks after operation. A, 1) Proximal left CCA, 2) right CCA, 3) distal left CCA. Asterisk indicates the dome of the venous pouch aneurysm; the plus sign, the fat pad for sealing the suture line. B, DSA shows the aneurysm and parent-vessel patency after 4 weeks. Green lines indicate the aneurysm neck width and aneurysm length and the contour of the in-flow parent-artery (left CCA). Red line shows the distance of the neck plane center from the parent-artery contour.

Angiographic evaluation

Aneurysm No.	Patency	Parent Artery ø (mm)	Length (mm)	Neck Width (mm)	Aspect Ratio	Ohshima Shift (mm)	Ohshima Type
1	No
2	Yes	2.40	8.40	4.70	1.79	1.60	B
3	Yes	1.90	7.70	3.70	2.08	1.70	B
4	Yes	2.60	7.50	3.90	1.92	1.80	B
5	Yes	2.70	7.50	4.10	1.83	1.60	B
6	Yes	2.50	8.00	4.20	1.90	2.10	B
7	Yes	1.90	8.60	4.30	2.00	1.80	B
8	No
9	Yes	2.60	8.00	4.00	2.00	2.10	B
10	Yes	2.40	8.10	4.10	1.98	1.50	B
11	Yes	1.90	7.60	3.90	1.95	1.30	B
12	Yes	1.60	7.40	3.80	1.95	1.40	B
13	Yes	1.90	7.40	4.10	1.80	2.10	B
14	Yes	2.40	7.10	4.10	1.73	1.80	B
15	Yes	2.30	7.90	4.20	1.88	1.50	B
16	Yes	2.50	8.00	4.80	1.67	2.00	B