Abstract
Response: We read the letter by Drs Willem Jan van Rooij and Menno Sluzewski criticizing our study,1 and herein address their critiques of our methodology and results. We find the comments of Drs van Rooij and Sluzewski similar in content and tone to their recent letter criticizing another study of packing density which used comparable methods for calculating aneurysm sac volumes.2,3 We invite interested readers to review this letter, from which we conclude that Drs van Rooij and Sluzewski share 4 of our beliefs, which are central to the purpose and design of our study: (1) density of aneurysm packing (volumetric percentage occlusion or VPO) affects durability of occlusion and thus outcome, (2) VPO is generally inversely related to aneurysm volume (higher packing densities are usually achieved in smaller aneurysms), (3) a study measuring packing density must use the most accurate method of calculating …
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