The second type, multi-focal fibroplasia, involves thickening of the media and collagen formation. It is typically reported as having the appearance of a ‘string of beads’ on angiographic review.[1] "The 'bead' component is often larger than the normal arterial lumen, and in a subset of patients with FMD, aneurysms are present that may require treatment." [4] The multi-focal subtype of FMD accounts for nearly 80% to 90% of all FMD cases.[4] (previously known as medial)