"In order for a vessel to be compressed and obstructed, the force that the torsion imparts on the vessel needs to be greater than the pressure of blood within. Hence, the first vessel to be compromised is the vein resulting in venous stasis with mesenteric injection; if the torsion is not corrected venous infarction and bowel perforation may occur. Depending on the torsion, arterial compromise may occur causing frank bowel ischaemia."