Signal voids are typically observed in these vessels on equally T1- and T2-weighted spin echo sequence, whereas a hypersignal is observed on gradient echo and contrast-Improved angiographic sequences indicating a large-movement lesion. Transcranial Doppler ultrasound. Takes advantage of sound waves to find out the velocity of blood movement as a https://www.sgvascularctr.com/understanding-venous-malformation-treatments-in-singapore/