<prompt> Which of the following is False regarding fibromuscular dysplasia ?Most common histologic subtype is medial fibroplasiaMostly affects medium sized vesselsMost common in young malesString of beads appearance is seen on angiography  <response>: Fibromuscular dysplasia FMD Abnormal development or growth of cells in the walls of aeries that can cause the vessels to narrow or bulge. Most common form- Medial fibrosis Young women and affects the distal 23 of the main renal aery. Bilateral. The iliac aeries are the limb aeries most likely to be affected by fibromuscular dysplasia. Gross: Alternating thickened and thinned aerial walls give rise to the characteristic sausage-string or string of beads appearance especially as seen on angiography Histology: fibromuscular thickening of the media alternating with areas of thinning and loss of the internal elastic lamina. 