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Right distal ICA and M1 segment MCA thrombosis seen on CTA without obvious features of infarction on the non-contrast CT but with evidence of a large area of abnormal perfusion (Tmax>6s, estimated volume 221ml) and small infarct core (CBF<30%, estimated volume 1.2ml) giving an estimated ischaemic penumbra of 220ml. The patient proceeded to the angiography suit for clot retrieval.