<unk>  can be found in almost every artery in the human body, but most often affects the carotid, vertebral, renal arteries and even those that supply the intestines, arms, and legs. Patients may present with<unk>  in multiple vessels.<unk>  has been pathologically categorized into three types of classifications: Multi-focal, focal, and adventitial; referring to the particular layer of arterial wall being affected. Focal In pediatrics, the most prevalent form of<unk>  is focal fibroplasia. Focal fibroplasia is described as long, narrow, irregular or smooth focal stenosis and can occur in any arterial bed. Whilst it is the most common type amongst children, it only accounts for approximately 10% of<unk>  cases overall. It most often presents with ischemic symptoms, and frequently mistaken for Takayasu arteritis. (previously known as intimal) Multi-focal 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. "The 'bead' component is often larger than the normal arterial lumen, and in a subset of patients with<unk> , aneurysms are present that may require treatment." The multi-focal subtype of<unk>  accounts for nearly 80% to 90% of all<unk>  cases. (previously known as medial) Adventitial The third classification is adventitial fibroplasia, in which collagen replaces the fibrous adventitia and extends beyond the artery. This form is considered rare but angiographic appearance may look similar to the focal subtype of<unk> , making the distinction difficult.
Fibromuscular dysplasia
Arteriosclerosis obliterans
Familial myxovascular fibromas
Endocardial fibroelastosis
Fibromatosis
Familial thoracic aortic aneurysm
Actinic elastosis
Collagen disease