The first Circulation Rounds for the 2006-2007 school year and the 9th Circulation Rounds overall took place in the Terrence Donnelly Cardiovascular Laboratories at St. Michael’s Hospital, Toronto on November 6, 2006. Dr. David Courtman was the speaker for the evening, who presented an interesting talk entitled “Vascular Biology of Arterial Aneurysms.” Dr. Courtman discussed the rising prevalence in the last few decades of abdominal aortic aneurysms, predominately in the aging male population. Human abdominal aortic aneurysms have very disorganized collagen structures and Dr. Courtman described how his laboratory is now using laser capture microscopy to examine smooth muscle cells from abdominal aortic aneurysm samples and elucidate their gene expression profiles compared to the whole structure. Dr. Courtman also presented a very helpful synopsis on vascular remodeling as a whole and thoroughly illustrated how remodeling is an adaptive response which depends on the extent and direction of rearrangement of vascular matrix and the balance of this response can lead to either stenosis (inward remodeling) or aneurysm (outward remodeling) formation. The event was well attended by a variety of research enthusiasts, largely consisting of students, postdoctoral fellows and research associates. The topic brought forth much discussion as there was a lot of interest in the development of and treatments for aneurysms. This event was sponsored by the Cardiovascular Sciences Collaborative Program Student Association and was well received.