Mesenteric adenitis: inflammation of the lymph nodes (adenitis) located in a membrane that attaches the intestines to the abdominal wall (known as the mesentery). Infections are the most common cause of mesenteric adenitis. Less commonly, tumors or other diseases can be the source of the inflammation in mesenteric adenitis. Symptoms include abdominal pain, abdominal tenderness, and fever. Other symptoms that can develop include nausea, vomiting, fatigue, or diarrhea. A type of bacteria known as Yersinia enterocolitica is the most common cause of mesenteric lymphadenitis in children.
Hameson, JL, et al. Harrison's Principles of Internal Medicine, 20th ed. (Vol.1 & Vol.2). McGraw-Hill Education 2018.