diagnostic methods collaterals tcd transcranial doppler hemodynamics infarction acute stroke pial collaterals arterial collaterals venous collaterals tectal plxus orpital plexus leptomeningeal anastomosis circle of wills mri angiography ct angiography digital subtraction angiograph collateral cerebral circulatio cerebral collaterals dsa ct mr interventional radiology ct guided biopsy ultrasound guided biopsy random kidney biopsy
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