The patient was a 74-year-old man. He visited our emergency room late at night with acute abdominal pain. Abdominal contrast computed tomography (CT) showed marked wall thickness of the transverse colon and increasing density of panniculitis around the colon. We suspected colonic necrosis with non-occlusive mesenteric ischemia, and performed emergency operation. From hepatic flexure, marked edema and redness of the transverse colon and the mesentery were observed, but no necrosis or perforation were observed. We performed right hemicolectomy. Histopathological findings showed lymphocyte infiltration of the veins and partial occlusion. The arteries were uninvolved ; therefore, we diagnosed the patient with enterocolic lymphocytic phlebitis (ELP). The postoperative course was favorable, and he was discharged from the hospital on the 9th postoperative day. He developed no recurrence after the surgery. We report a case of ELP, which is a rare disorder.