Current scans revealed only "multiple enlarged root of mesentery lymph nodes". largest is 2.6 x 1.6 cm. is this cancer? are there noncancerous causes?

Mesenteric adenitis: Maybe. Mesenteric adenitis (enlargement of lymph nodes in abdominal mesentery) is commonly seen in conditions that mimic acute appendicitis. When accompanied by inflammation of the ileum, ; crohn's disease has been excluded, consider bacterial infection caused by yersinia enterocolitica, campylobacter, salmonella. Adenitis may also reflect non-gi inflammatory processes in the abdomen.