Intestinal glandular inclusions (glandular choristoma) in the mesenteric lymph node of a goat

Gastric duplication: proventricular cystic choristoma on the spleen of a broiler chicken

Gastric duplication (choristoma) is a very rare anomaly in both humans and other animal species. We report herein a case of proventricular cystic choristoma in a 62-day-old broiler chicken. The broiler chicken was brought from the slaughterhouse to our laboratory after a pale-brown cystic structure closely attached to a thin, compressed spleen was identified. On necropsy, the cystic structure showed a clear mucinous fluid. Histopathologically, the cystic structure was lined by proventricular mucosa presenting in folds and sulci. Submucosal proventricular glands, consisting of secretory units and collecting tubules, occupied parts of the choristomal wall. The gastric mucosa lining the choristomal wall stained positive with periodic acid-Schiff stain, stained negative with Alcian blue staining, and showed a thin layer of smooth muscle fibers and a thick connective tissue layer with Masson trichrome. Ectopic pancreas was noticed attached to the wall of the choristoma. To the best of our knowledge, this represents the first report of choristoma in an avian species.

Epithelial and pancreatic choristoma in bovine lymph nodes

Lymph nodes from 186 cows were evaluated as part of a bovine tuberculosis eradication programme. The mediastinal lymph nodes of 13 animals contained atypical structures. In 12 cases (6.45%) these consisted of multiple epithelial structures and, in one case, of pancreatic-like tissue. Immunohistochemistry (IHC) revealed that the epithelial structures were consistent with respiratory epithelium and with ectopic pancreatic tissue, respectively. To the best of our knowledge these are the first histological and immunohistochemical descriptions of epithelial and pancreatic choristomas in bovine lymph nodes.