title: Reply.
authors.affiliation: Acandis GmbH and Co. KG Pforzheim, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Cattaneo
authors.affiliation: Department of Neuroradiology.
authors.forename: M
authors.initials: M
authors.lastname: Schumacher
authors.affiliation: University Heart Center.
authors.forename: G
authors.initials: G
authors.lastname: Trummer
authors.affiliation: Department of Neuroradiology University Hospital Freiburg, Freiburg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Urbach
authors.affiliation: Department of Neuroradiology University Hospital Freiburg, Freiburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Meckel