<prompt> True regarding fibromuscular dysplasia are all exceptMedium size vesselsOCPS predisposeAneurysm may occurIrregular hyperplasia  <response>: OCPS predispose Fibromuscular dysplasia affects mainly medium and large aeries. Sometimes alteration of the normal normal structure of the aerial wall gives rise to true aneurysms. There is also associated irregular hyperplasia. Muirs Textbook of pathology Edited by JR Anderson, 12 th edition, page no 14.36 Answer is option 2 