caa a22 4500 44535559X CHVBK 20180317142859.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10072-011-0763-5 doi (NATIONALLICENCE)springer-10.1007/s10072-011-0763-5 Posterior circulation ischemia in patients with fetal-type circle of Willis and hypoplastic vertebrobasilar system [Elektronische Daten] [Piergiorgio Lochner, Stefan Golaszewski, Francesca Caleri, Gunther Ladurner, Frediano Tezzon, Giulio Zuccoli, Raffaele Nardone] Little attention has been given to the fetal-type posterior circle of Willis (FTP) in the literature; also symptomatic basilar artery (BA) hypoplasia has been rarely reported. We aimed to illustrate that the association of a hypoplastic vertebrobasilar system (VBS) with the FTP may lead to posterior circulation ischemia. Magnetic resonance imaging and three-dimensional time-of-flight magnetic resonance angiography were performed in 88 consecutive patients with ischemic stroke or TIA in the VBS. Thirteen patients were identified with either stroke or TIA in the context of a hypoplastic VBS and a fetal origin of the posterior cerebral arteries. All patients had unilateral or bilateral FTP, hypoplastic BA and at least one hypoplastic vertebral artery. Transcranial color-coded duplex revealed decreased flow velocity and increased pulsatility index along the BA. A hypoplastic VBS may be accompanied by the FTP and its simultaneous occurrence can predispose to ischemic events in the posterior circulation. Springer-Verlag, 2011 Circle of Willis nationallicence Fetal variant nationallicence Hypoplasia nationallicence Magnetic resonance imaging nationallicence Transcranial color-coded duplex ultrasonography nationallicence Vertebrobasilar system nationallicence Lochner Piergiorgio Department of Neurology, Franz Tappeiner Hospital, Meran/o, via Rossini, 5, 39012, Meran/o, BZ, Italy aut Golaszewski Stefan Department of Neurology and Institute of Neuroscience, Christian Doppler Clinic, Paracelsus Private Medical University, Salzburg, Austria aut Caleri Francesca Department of Neurology, Franz Tappeiner Hospital, Meran/o, via Rossini, 5, 39012, Meran/o, BZ, Italy aut Ladurner Gunther Department of Neurology and Institute of Neuroscience, Christian Doppler Clinic, Paracelsus Private Medical University, Salzburg, Austria aut Tezzon Frediano Department of Neurology, Franz Tappeiner Hospital, Meran/o, via Rossini, 5, 39012, Meran/o, BZ, Italy aut Zuccoli Giulio Department of Pediatric Radiology, Children's Hospital, Pittsburgh, USA aut Nardone Raffaele Department of Neurology, Franz Tappeiner Hospital, Meran/o, via Rossini, 5, 39012, Meran/o, BZ, Italy aut Neurological Sciences Springer Milan 32/6(2011-12-01), 1143-1146 1590-1874 32:6<1143 2011 32 10072 https://doi.org/10.1007/s10072-011-0763-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10072-011-0763-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lochner Piergiorgio Department of Neurology, Franz Tappeiner Hospital, Meran/o, via Rossini, 5, 39012, Meran/o, BZ, Italy aut NATIONALLICENCE 700 1- Golaszewski Stefan Department of Neurology and Institute of Neuroscience, Christian Doppler Clinic, Paracelsus Private Medical University, Salzburg, Austria aut NATIONALLICENCE 700 1- Caleri Francesca Department of Neurology, Franz Tappeiner Hospital, Meran/o, via Rossini, 5, 39012, Meran/o, BZ, Italy aut NATIONALLICENCE 700 1- Ladurner Gunther Department of Neurology and Institute of Neuroscience, Christian Doppler Clinic, Paracelsus Private Medical University, Salzburg, Austria aut NATIONALLICENCE 700 1- Tezzon Frediano Department of Neurology, Franz Tappeiner Hospital, Meran/o, via Rossini, 5, 39012, Meran/o, BZ, Italy aut NATIONALLICENCE 700 1- Zuccoli Giulio Department of Pediatric Radiology, Children's Hospital, Pittsburgh, USA aut NATIONALLICENCE 700 1- Nardone Raffaele Department of Neurology, Franz Tappeiner Hospital, Meran/o, via Rossini, 5, 39012, Meran/o, BZ, Italy aut NATIONALLICENCE 773 0- Neurological Sciences Springer Milan 32/6(2011-12-01), 1143-1146 1590-1874 32:6<1143 2011 32 10072 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer