<prompt> An embolus which passes through an arteriovenous communication and enters the systemic circulation is called?Paradoxical embolusRetrograde embolusSaddle embolusAtheroembolus  <response>: Rarely, an embolus passes through an atrial or ventricular defect and enters the systemic circulation called paradoxical embolism.Pulmonary Embolus can occlude the main pulmonary artery, lodge at the bifurcation of the right and left pulmonary arteries called saddle embolus.Robins Textbook of pathology 10th ed Page 112 