I was given a neck shot muntjac deer last week, and have just skinned it. Between the shoulders on the spine was a sack filled with a fluid, although it was not very watery - I accidentally pierced said sack when pulling the skin and what looks like a thick green puss came out. It didn't smell and came off easily in almost one lump. I have cut the meat off next to it, I assume the rest of the carcass will be safe to eat? There was no other signs of injury like shotgun wounds or anything.
Anyone tell me what it is likely to have been?