Have a first calf heifer, due Feb 1st, that has this condition. Never seen it before, so it is a new one to me. She basically has a swelling directly in front of the udder, a little bigger than a softball. Vet said it is more common in dairy animals. My vet said it will more than likely go away shortly after calving. Said I could massage it a couple times a day for 10-20 minutes and that might help, but he would just let her be.
Here is the link from the Merck Vet manual.
http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/111503.htm
Here is the link from the Merck Vet manual.
http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/111503.htm