RESUMO
Syngeneic and allogeneic grafts of segments of the thoracic duct from rats were investigated in the first fifteen days after transplantation. The patency rate--evaluated by the passage of blue dye--of the allogeneic transplants was almost equal to that seen in the syngeneic grafting. By direct exploration there were no changes to be seen in the syngeneic and allogeneic transplants. Investigations by electron microscopy showed no major reactions to the syngeneic grafts during the observation time: The endothelium always was completely detectable and the subendothelial layer of collagen fibrils was not dislocated. By contrast, the allogeneic transplants showed considerable alterations as disintegration of the collagen fibrils and a partial loss of endothelium occurred after eight to ten days. After fifteen days, however, the formation of a neointima could be demonstrated. Despite the observed alterations there was no loss of function in the allogeneic transplants.
