Definition When venous emboli become dislodged from their site of origin, they embolize to the pulmonary arterial circulation or, paradoxically to the arterial circulation through a patent foramen ovale About 50% of pts with pelvic or proximal leg deep venous thrombosis have pe Isolated calf or upper extremity venous thrombosis pose a lower risk for PE MBBS project, Zhongshan HospitalMBBS project, Zhongshan Hospital Definition • When venous emboli become dislodged from their site of origin, they embolize to the pulmonary arterial circulation or, paradoxically to the arterial circulation through a patent foramen ovale — About 50% of pts with pelvic or proximal leg deep venous thrombosis have PE — Isolated calf or upper extremity venous thrombosis pose a lower risk for PE