Discussion of Mesenteric adenitis
- Mesenteric adenitis is a self-limited inflammatory process that affects the mesenteric lymph nodes in the right lower quadrant.
- Its clinical presentation mimics that of acute appendicitis.
- Mesenteric adenitis is most frequently caused by viral pathogens, but other infectious agents have been implicated, including Yersinia enterocolitica, Helicobacter jejuni, Campylobacter jejuni, and Salmonella or Shigella species.
- In younger children and infants, concurrent ileocolitis may be present; this finding suggests that the lymph node involvement may be a reactive process to a primary enteric pathogen.
- Most cases are self-limited, although disease lasting longer than 2 weeks is common.
- Mesenteric adenitis can occur in adults, but it is most common in children and adolescents younger than 15 years.
- The diagnosis of mesenteric adenitis is one of exclusion; confirmation is based on a benign clinical course, and management is conservative.
 Imaging Findings for Mesenteric adenitis
- 3 or more nodes with a short-axis diameter of at least 5 cm clustered in the right lower quadrant.
- Lymph nodes are generally larger, more numerous, and more widely distributed in mesenteric adenitis than in appendicitis.
- Enlarged mesenteric lymph nodes may be with or without associated ileal or ileocecal wall thickening.
- Ileal thickening is diagnosed when the wall is thicker than 3 mm over at least 5 cm of the bowel despite bowel lumen opacification and distention.
 See Also
 External Links
 References for Mesenteric adenitis
- E-medicine mesenteric adenitis article.