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Twenty-two cases with communication of an artery and the portal vein or one of its tributaries are discussed. Four conditions in which relatively significant arterio-portal shunts may exist can be differentiated: (1) angiodysplasias or arteriovenous malformations, (2) cirrhosis of the liver and inflammatory lesions, (3) traumatic and postoperative lesions, and (4) benign and malignant tumors. The significance of the portal vein's early opacification during arteriographic examinations of the abdominal organs is discussed, and the findings are compared to those reported in the literature.

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