I picked up some 2 yr old layers from some guy today for $1 each and butchered them. I've done several butcherings before (mostly my own birds), but never come across this before. When we gutted the birds, we found that two of them each had a fairly large, ovalish, hard mass inside. It was not attached to anything. They were yellowish and wrinkly. Cutting one open, there was a horrid smell inside and it was kind of darkish and crusty with some of it hollow. Unfortunately, I didn't have my camera with me to take a picture to show you. I didn't know if it was some kind of cancerous growth or what. Any of you come across this before? What did you do? I ended up just tossing the birds out, just in case. Kind of maddening after going to the trouble of plucking them out in the cold wind though. Ah, well. Our freezer is well stocked now with the makings of soup!