Mycobacterium avium intracellulare.
This organism is not normally pathogenic but in patients with AIDS infiltration of the lamina propria by macrophages packed with bacteria may produce endoscopically visible abnormalities. The appearances of diffuse nodularity with enlarged and visible villi (Fig. 2.570) may mimic Whipple's disease. Figure 2.571 shows the typical histopathological features, in this case involving the duodenum.
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