Nine patients with endoscopically identified dilated lacteals of the duodenum were studied for evidence of pathologic intestinal lymphangiectasia. Three of the nine patients also had lymphangietic cysts in association with dilated lacteals. Duodenal biopsies, laboratory data, and imaging studies were performed in each patient. In addition, a 14C triolein fat absorption study was performed to assess subclinical malabsorption. Biopsies revealed dilated lymphatic channels in all patients, but laboratory studies failed to suggest intestinal losses of protein or fat, and radiographic abdominal imaging failed to define any of the causes of secondary lymphangiectasia. Eight of the nine patients had adequate fat absorption as measured by the 14C triolein breath test. Our data suggest that patients with incidentally discovered dilated lacteals and no clinical evidence of malabsorption may have a functional intestinal lymphangiectasia. Follow-up endoscopy probably is not warranted in this population.
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