Where do you get the idea from, that the bullet "travelled just above the top of the right lung"?
Bernd, I was bouncing Tim's own post back at him.
"They had an entrance wound in the posterior at the base of the neck. The X-Rays revealed no bullet inside the body. After removing the breastplate they found a contusion on the apex of the upper lobe of the right lung.
It was obvious to them that the bullet had gone over the top of that lung. They came to realize that the bullet had to have exited from the front of the neck. Humes' phone call to Dr. Perry confirmed it for them."