Lymph nodes in the transverse colonic mesentery are commonly seen in the following diseases: lymphadenitis, lymph node metastasis, lymphoma and so on. 1. Lymphadenitis: If inflammation occurs in the intestines or in the abdominal cavity, the inflammation may spread to the lymph nodes in the transverse mesenteric lymph nodes, which will lead to lymphadenitis, and the mesenteric lymph nodes will appear enlarged. 2. Lymph node metastasis: if malignant tumor occurs, such as transverse colon cancer, tumor cells may have lymph node metastasis, which is called lymph node metastasis, and lymph nodes of transverse colonic mesentery will be enlarged. 3. Lymphoma: after the occurrence of this disease, there will be multiple enlarged lymph nodes in the body, and the lymph nodes in the transverse mesenteric membrane may also be enlarged, which is manifested as localized lymph nodes. It is necessary to go to the regular medical institutions, and further improve the relevant examination, usually can clarify the cause, and then can be dealt with accordingly.