Is pseudoaneurysm genetic?

Is Pseudoaneurysm Genetic? What You Need to Know

While most pseudoaneurysms result from trauma, surgery, or infection, emerging evidence suggests that genetics can play a role in some cases. A pseudoaneurysm—sometimes called a "false aneurysm"—occurs when a blood vessel wall is weakened, allowing blood to leak and pool between the layers of the vessel wall. Unlike true aneurysms, pseudoaneurysms involve a break in the vessel lining, but the surrounding tissue keeps it contained.

Although not inherited in a direct genetic pattern like eye color, certain inherited conditions significantly increase the risk of developing pseudoaneurysms. Ehlers-Danlos syndrome, particularly the vascular type, is one such disorder. It affects collagen production, weakening blood vessel walls and making them more prone to tears and pseudoaneurysm formation. Similarly, Marfan syndrome, a connective tissue disorder caused by a mutation in the FBN1 gene, can lead to structural weaknesses in the aorta and other arteries, raising the likelihood of vascular complications.

Autoimmune conditions that damage connective tissues—like lupus or polyarteritis nodosa—can also contribute. These diseases trigger inflammation in blood vessels (vasculitis), which may erode the vessel wall and lead to pseudoaneurysms over time. While not genetic per se, some autoimmune disorders have a hereditary tendency, further linking family history to vascular risk.

So, while most pseudoaneurysms aren’t directly inherited, underlying genetic or autoimmune conditions can create a fertile ground for their development. If you or a family member has a history of connective tissue disorders or unexplained vascular issues, it’s worth discussing with a healthcare provider. Early monitoring and management can make a significant difference in preventing complications.