“…1,2,7,12,18,19 The histology of these lesions is distinct from atherosclerosis and fibromuscular dysplasia. Common findings include intimal thickening or hyperplasia, with myofibroblast proliferation identified by actin staining, 1,2,7-10,20 spindle-shaped or stellate cells, 9,21 collagen deposition, 20,21 and formation of a neointimal elastic membrane. 2,9,10,21 In addition, medial hypertrophy or foci of medial fibrosis and adventitial thickening have been reported.…”