We just cut one in the exact same place in a doe for a friend of ours yesterday. It wasn't quite as big...about size of a softball, but essentially looked the same.
It took awhile, but we did find the pus and it took us about 30-40 minutes to drain all we could. We cut on the bottom of the lump first and couldn't get pus. We then stuck a needle in on the side and were able to get some pus and decided to cut there. When we were squeezing on the lump, we also could hear that it was possibly pushing on the wind pipe, restricting breathing.
We gave 8cc Nuflor, 10cc LA 300, 5cc Vitamin A E & D & 2.5cc Dectomax. We kept flushing with iodine which seemed to loosen pus everytime we squirted it in there and massaged it.
She's alive today....we'll see how she does here in the next week.