fÍstula yeyuno-colónica por linfoma mesentérico: una causa inusual de diarrea

Enterocolonic fistula is a rare complication of lymphoma of mesenteric origin and an unusual cause of chronic diarrhea in patients without immunosuppression or inflammatory bowel disease. We report the case of a 68-year-old female patient with abdominal pain and chronic diarrhea that revealed a jejunocolonic fistula on imaging and endoscopic evaluation. Surgical block resection was performed and the histological and immunohistochemical analysis of the surgical specimen evidenced a high-grade B non-Hodgkin lymphoma originating from a lymph node of the mesentery with secondary extension to the jejunum and colon. The diagnosis is challenging due to the non-specific clinical picture and the wide differential diagnosis, for which an adequate anamnesis, physical examination and imaging evaluation are essential in order to characterize the lesion and schedule surgery. The prognosis and adjuvant treatment will depend on the type of tumor and its staging. This is the first local case report of a patient with a jejuno-colonic fistula secondary to a high-grade B-type non-Hodgkin lymphoma originating from a mesenteric lymph node with extension to the small intestine and colon.