Reply:

We greatly appreciate the suggestions by Dr Groth and colleagues about the potential use of volumetric analysis in the evaluation of recurrent aneurysms. Unfortunately, this sort of volumetric analysis would very likely add little in terms of providing objective guidance about re-treating a given aneurysm, as the authors of the letter acknowledge. The use of volumetric analysis might have some value in the context of a clinical trial but very likely would offer scant benefit to clinical practice. We do, however, applaud any attempt to provide improved analytic tools to the aneurysm-research community and wish Dr Groth and colleagues success in their chosen line of investigation.