I cannot find any information on root of mesenteric lymph nodes that are enlarged above 2cm. please someone tell me what could cause this?

Your doctor can/shou: You will need a good doctor to guide you further. Lymph nodes of this size in your abdomen(mesentry) are suspected to be abnormal and would require further monitoring and a possible biopsy if they get larger than 2-3 cm in size. If you have any abdominal symptoms, go see an oncologist to seek guidance and monitoring of the lymph nodes.