Adenocarcinoma is a form of carcinoma that originates in glandular tissue. To be classified as adenocarcinoma, the cells don't necessarily need to be part of a gland, as long as they have secretory properties. This form of carcinoma can occur in some higher mammals as well as humansFauquier, D.A., Gulland, F.M.D.,(Marine Mammal Center}, Haulena, M., Spraker, T., ‘’Billary adenocarcinoma in a stranded Northern elephant seal (‘’Mirounga angustirortsis’‘)’‘, Journal of Wildlife Diseases 39(3):723-726 (2003).
It can first present as an adenoma (a glandular tumor that is benign.)

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