Figure 2From: Unusual primary HIV infection with colonic ulcer complicated by hemorrhagic shock: a case report Biopsy of the caecal ulcer. The colic biopsy shows an acute inflammation in the lamina propria, consisting of an increase in polymorphonuclear cells. The neutrophils infiltrate the mucosa, leading to crypt abscess (arrowhead), flattened epithelial cells, and erosion (arrow).Back to article page