<prompt> Most common source of systemic emboli is:Varicose veinsMural thrombiCardiac thrombiPulmonary embolism  <response>: Ans: B Mural thrombi Ref: Kumar Robbin, Pg 91Explanation:Systemic Thromboembolism80 from cardiac mural thromboembolism75 of it is from LV infarcts25 with dilated LAAortic aneurysm, atherosclerotic plaque, valvular vegetations, paradoxical embolismCommon arterial embolisation sites- Lower extremities 75, CNS 10, intestines, kidneys and spleenPulmonary thromboembolism occurs most commonly from DVT 