Signalment:10 year old, castrated male, standard schnauzer dog
History:A pheochromocytoma was diagnosed by internal medicine on Feb 9, 2021. The tumor was removed by surgical oncologists May 3, 2021. Intestines became discolored dark grey during surgery. The patient recovered uneventfully from anesthesia but declined rapidly post-op, with continuous bloody diarrhea, regurgitation, and poor appetite.
Gross Lesions:The mesenteric arcade is dark red. There is extensive, coalescing ulceration of the small intestinal mucosal surface throughout the duodenum, jejunum, and ileum, affecting approximately 65% of the mucosal surface, with hemorrhage along the interface of normal and ulcerated mucosa. Linear ulcers are within the orad colon.