PMC10404836_01
The duodenal biopsy shows normal villous architecture (a) and a closer look at slightly higher magnification shows increased intraepithelial lymphocytes (b) that were formally counted and showed a peak count of 35 per 100 epithelial cells. The differential diagnosis includes celiac diseases versus its many mimics on histology. The final diagnosis in this case was immunotherapy associated enteritis
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F1
Peak IEL count was 35 per 100 epithelial cells (Figure 1a-b).