Hyperdense artery sign, symptomatic infarct swelling and effect of alteplase in acute ischaemic stroke oleh Ming Liu, Joanna M Wardlaw, Grant Mair, Richard I Lindley, Simiao Wu, Geoff Cohen, Zoe Morris, Anders von Heijne, Nick Bradey, Lesley Cala, Andre Peeters, Andrew J Farrall, Alessandro Adami, Gillian Potter, Peter A G Sandercock