Figure 3.

Immunohistochemical findings of the tumor. Immunostaining for CEA. The cytoplasm of neoplastic cells shows diffuse strong positive reaction to CEA (A, x 200). Immunostaining for CK20. The tumor cells also exhibit diffuse positive reaction to CK20 (B, x 200). Immunostaining for CDX2. The nuclei of neoplastic epithelial cells display diffuse strong positive reaction to CDX2 (C, x 200). Immunostaining for CD15. The cells are focally positive for CD15 (D, x 200). Immunostaining for PAX8. The cells are negative for PAX8 (E, x 200). Immunostaining for WT-1. The cells are negative for WT-1 (F, x 200).

Kim et al. Diagnostic Pathology 2012 7:139   doi:10.1186/1746-1596-7-139
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