• Taku Yasumoto, Keigo Osuga, Hiroshi Yamamoto, Yusuke Ono, Maki Masada, Koji Mikami, Daigo Kanamori, Masahisa Nakamura, Kaisyu Tanaka, Tetsuro Nakazawa, Hiroki Higashihara, Noboru Maeda, and Noriyuki Tomiyama.
• Department of Radiology, Toyonaka Municipal Hospital, Shibahara 4-14-1, Toyonaka, Osaka 560-8565, Japan. Electronic address: yasumoto@solid.ocn.ne.jp.
• J Vasc Interv Radiol. 2013 Dec 1;24(12):1798-807.

PurposeTo evaluate the correlation between packing density and the incidence of coil compaction or recanalization of visceral artery aneurysms (VAAs) after coil packing.Materials And MethodsBetween July 2004 and April 2012, coil packing was performed for 46 true visceral aneurysms (16 splenic, 11 pancreaticoduodenal, eight renal, six hepatic, three superior mesenteric, one right gastric, and one gastroepiploic) in 42 patients. The size and volume of the aneurysm, packing density, and the incidences of compaction and recanalization were evaluated retrospectively.ResultsThe mean follow-up period was 37 months ± 8 (range, 11-80 mo). The mean packing density was 19% ± 8 (range, 5%-42%), mean aneurysm size was 19 mm ± 8 (range, 5-40 mm), and mean volume was 4,108 mm(3) ± 5,435 (range, 72-26,235 mm(3)). Compaction and recanalization occurred in two (4%) and 12 aneurysms (26%), respectively. The mean packing density was significantly lower in aneurysms with compaction or recanalization than in unaffected aneurysms (12% vs 22%; P = .00014). There was a significant difference in mean packing density between small (< 20 mm; 22%) and large (≥ 20 mm) aneurysms (15%; P = .0045). The mean size and volume were significantly larger for coil-compacted or recanalized aneurysms than for unaffected aneurysms (P < .05). In aneurysms with a packing density of at least 24%, no compaction or recanalization occurred.ConclusionsCoil compaction or recanalization after coil packing for VAAs more often occurs after insufficient embolization with low packing density and in patients with large aneurysms.Copyright © 2013. Published by Elsevier Inc.

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