Abstract
Walker 256 carcinosarcoma, when transplanted directly into the left kidney, grew well in nearly all rats. After the transplantation, microangiography was performed using 0.2-0.3 ml of Micropaque as a contrast medium which was injected through a PE-50 polyethylene catheter in the left renal artery with a 1 ml syringe under a moderate hand pressure. The angiographic characteristics of the transplanted carcinosarcoma were (1) peculiar dilatation and tortuosity of regional branch vessels to the tumors, and (2) formation of a complete network by many small vessels derived from the main branches. The network covered the entire surface of each tumor.
