<prompt> Paradoxical embolism is detected by?MRI ChestBubble contrast EchocardiographyCT scan ChestImpedance plethysmography  <response>: Paradoxical embolism Condition where a clot from venous return enters into the left atrium and left ventricle. Hencefoh, it can travel to the brain leading to cryptogenic stroke. Have a patent foramen ovale which allows transit of clots in this fashion. Dx- Bubble contrast echocardiography is performed. 