Hens involved in a Newcastle disease study were euthanased at regular intervals according
to a designed protocol. Of these, 7.14%(n = 42) of the 82-week-old specific pathogen-free
breeder hens were found to have well-delineated firm white to yellowish nodules of
varying sizes in the abdominal cavity. Histologically, the nodules were identified as an
adenocarcinoma originating in the uterus. Transcoelomic spread was evidenced by the
presence of similar neoplastic cells embedded in the serosa and outer longitudinal muscle
layer of the intestines as well as the liver.