Papillary Endolymphatic Sac Tumor: A Case Report

Figure 2

Microscopy shows typical papillary structures (2(a), H&E × 100), lined by benign looking low cuboidal epithelial cells (2(b), H&E × 200). Tumor cells are immunopositive for cytokeratin (2(c), IHC (CK)[Daco] × 200) and S100 (2(d), IHC (S100)[Daco] × 200).

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