<prompt> Most common Cause of pseudaneurysm of aoa isSmokingTraumaMarfans SyndromeAge related degeneration  <response>: Answer- B. TraumaAoic pseudoaneurysms are contained ruptures of the aoa in which the majority of the aoic wall has been breached, and luminal blood is held in only by a thin rim of the remaining wall or adventitia.They typically occur from focal aoic transection-penetrating traumaBlunt trauma 