1. To understand the chronological evolution of findings in mesenteric ischemia and infarction studying the damage either with a 7T-micro MR or by macromicroscopic observation. 2. To be able to attribute each finding to one or more of the three etiological types of mesenteric ischaemia (arterial, venous, ischaemia/reperfusion). 3. To appreciate the efficacy of MRI, as an alternative tool in the early detection of this pathology.