[Upper mesenteric venous thrombosis revealing familial resistance to activated protein C]. / Thrombose veineuse mésentérique supérieure révélant une résistance à la protéine C activée familiale.

INTRODUCTION: Mesenteric venous thrombosis is a rare disease but potentially severe because of the prognosis of intestinal infarction with high mortality rate (60%). OBSERVATION: We report the case of a 55 year-old man who presented with an upper mesenteric venous thrombosis related to a familial resistance to C reactive protein through factor V Leiden mutation. COMMENTS: The discovery of a mesenteric venous thrombosis requires aetiological research that is usually multifactorial. Among the most frequent genetic coagulation abnormalities observed resistance to C reactive protein due to G202110A prothrombin gene mutation is the most common. Although factor V Leiden mutation is less frequent, it requires anticoagulation therapy for life in the case of the appearance of a thrombosis.