Duke University, through a separate BVMC project, is collecting vascular malformations (VMs) associated with HHT to search for somatic mutations, possibly occurring in different genes than the ones already identified. All HHT patients undergoing surgery to remove an AVM from any organ (i.e., liver, lung, brain, skin, etc.), are encouraged to consider donating  tissue. You do not need to have a brain AVM to participate in this study project.