The author presents 65 cases of portal thromboses, of which 18 were isolated, 34 associated with liver cirrhosis and 13 occured after surgery for porto-caval anasthomosis. Spontaneous thromboses were of the troncular type in 61,5% of the cases, extensive in 32,7% and radicular in 5,8%. In the group of isolated forms those of the extensive type were predominant (50%), while in those associated with cirrhosis, troncular thromboses were more frequent (73,5%). In 7 cases termino-lateral antro-porto-caval thrombectomy was performed with immediately favourable results in 3 cases, of which one was maintained in time as an extra-hepatic block.