Deeper Learning in Physiology?
It is very easy, use google + pathophysiology and read some articles in the actual topic. There are a lot of pathophysiology books as well (some of them pretty expensive). Another way to do an online course.

Just a simple search about your example:


  It is known that AAAs are characterized by destruction of elastin and
  collagen in the media and adventitia, loss of medial smooth muscle
  cells with thinning of the vessel wall, and transmural infiltration of
  lymphocytes and macrophages. Atherosclerosis is a common underlying
  feature of aneurysms. However, atherosclerosis is not the primary
  driving factor in the development of AAAs. Atherosclerosis is a
  disease that is widespread throughout the vasculature, however
  aneurysms only form in specific locations and only in certain
  individuals. Additionally, atherosclerosis is primarily a disease of
  the intima, while aneurysm formation primarily affects the media and
  adventitia.



2009 - The Pathogenesis of Abdominal Aortic Aneurysms