In 200 Wistar rats the spleen was transposed into a pouch between the muscle layers of the left abdominal wall. Collagenase powder was applied to the spleen surface. After 12 to 24 hours an acute haemorrhagic inflammation was seen. Collaterals developed from the splenic parenchyma to the abdominal wall from the 10th day. They connected the portal venous system with the caval system.
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