Mesenteric vein infarct associated with congenital antithrombin III (ATIII) deficiency.

A venous mesenteric infarction in a 27-year-old patient is reported. This patient presented a genetic quantitative AT-III deficiency without anticoagulation therapy. Ultrasonography revealed portal vein thrombosis and laparoscopy showed mesenteric vein infarction. Laparotomy was performed mmediately and revealed segmental infarction of 60 cm of the jejunum which was resected; the portal vein was considered to be partially occluded on palpation. No strangulation or mechanical factors were identified, Immediately postoperatively the patient received therapeutic doses of heparin with AT-III concentrates to increase AT-III levels; no recurrent thrombotic episode was observed. A systematic second-look operation 24 hours postoperatively showed good bowel viability. Five days later, long-term anticoagulation with acenocoumarol was decided, Twelve days later, ultrasonography showed complete portal revascularization which was confirmed by a third surgical operation on B60.