QuestionI observed tumour (tumor) at neck (down side) of a turtle. What you opinion about affected organ?
AnswerI am not a vet, nor psychic. Without more information, I cannot even guess an answer here- but since I am not a vet, even with lots of info I might not be able to give a good answer.
Try a good turtle forum like turtletimes.com or http://www.turteforum.com to find several experienced keepers who might be able to help.