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On light microscopy, cohesive epithelial cells were noted with abundant clear to pale eosinophilic cytoplasm. There was presence of nuclear pleomorphism and conspicuous eosinophilic nucleoli (A; H&E, 40×). Tumour cells showed strong cytoplasmic expression of cytokeratin (B; 40×) and p63 (C, 40×), but did not express HMB-45 (D, 40×).
