Computed tomography of gastrointestinal lymphoma.

From 275 computed tomographic (CT) examinations with positive findings of abdominal lymphoma, 26 patients were found to have gastrointestinal involvement by the disease. The stomach was most commonly involved, followed by small bowel, colon, and duodenum. CT was found to be accurate in detecting wall thickening and complications such as perforation and fistulization. False-negative examinations occurred in two patients with small submucosal gastric deposits ("bull's-eye" lesions). False-positive examinations were seen in two patients with hypertrophic gastritis. The CT manifestations of gastrointestinal lymphoma, correlated with the barium study appearance, are the subject of this report.