In this photo you can see that the two stumps of the vas deferens have been cleanly cut and are ready for attachment.
The opening in the stump going into the abdomen (left) is smaller than that on the testicular side (right). In the years following the vasectomy, pressure has built up on the testicular side. This pressure has stretched the inside of the vas.
You will also note that on the abdominal side, all layers of the vas are clearly visible giving it a "bullseye" appearance. On the testicular side, the chronic pressure build-up has damaged the walls of the tube and the layers are no longer distinct.
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