The results of the necropsy I had done almost 3 and a half weeks ago for my one hen that was so bad, that my large animal vet and I thought could be Merek's Disease, turned out to be a form of cancer. Below is the cut and pasted results: Animal Information: Chicken ; Galliform / poultry - Chicken History: General: Chicken, female. 3 years of age, plus of chronic weight loss. Left leg significant neurologic loss Right leg less significant neurologic loss Diarrhea Necropsy Results: Crop dilated- Lymphosarcoma possible Abdomen contained 500 cc reddish brown fluid Small Intestine cordid and thickened Lab Findings: Pathology Specimen Test Name Chicken - Avian - Galliform / poultry - Chicken Tissue, fixed - 1 Pathology (Microscopic Exam - Biopsy) - 11/2/2011 4:27 PM General Results: Intestine: Mural and mesenteric melanoma. In a second section of intestine, there are aggregates of dark brown to black pigmentcontaining cells in the mesentery, suggestive of melanoma. Liver: Capsular melanoma. There are similar pigment containing cells in the sinusoids and forming small aggregates throughout the liver, suggestive of melanoma. Hepatitis, periportal and random, heterophilic and histiocytic, multifocal, mild with multifocal necrosis, multifocal bile stasis, and multifocal bile duct proliferation. Comment: Although melanosis is common in breeds such as Silkies, the pigmented cells in this bird form nodular masses, supporting the diagnosis of melanoma cancer. Melanomas are not common in chickens but have been reported. Interestingly, in one study, malignant melanin-containing neoplasms originated from the ovary and metastasized throughout the coelom. In addition to the neoplastic process in the liver, there is also an inflammatory process for which I am unable to provide an etiologic diagnosis, as no etiologic agent is observed.