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[Paradoxical systemic emboli. 5 case reports].

Paradoxical systemic embolism by venous emboli in the arterial circulation can be explained by a right-left shunt. In 5 patients, the diagnosis of paradoxical emboli was definite in three cases, and suspected in two others. Venous, arterial and cardiac angiography define the anatomical criteria which alone can confirm the diagnosis. The introduction of a caval filter can prevent recurrent emboli which has a serious prognosis.