I had a hen that died of a pendulous crop. I took her to the vet (a bird specialist), he didn't seem too impressed. He said she has some kind of blockage. Then sold me $150. injectable anti-biotic to be used twice a day for two weeks. She lasted one week. Firstly, I feel stupid for spending that kind of money. I should have done more research on this before seeing the Vet. And third, that Doctor is a jerk.
Now I have another hen with the same problem. I have learned alot since the first one died. I will try to treat her myself but am resigned to the fact the she might not survive.