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Figure 2: Immunohistochemical (IHC) staining of tumor cells showing: (a) diffuse cytoplasmic positivity for chromogranin (40×); (b) strong membranous positivity for epithelial membrane antigen (40×); (c) negative for thyroid transcription factor 1 (100×); (d) negative for cytokeratin 20 (40×); (e) negative for tumor protein 63 (40×); and, (f) negative for smooth muscle actin (40×)

Figure 2: Immunohistochemical (IHC) staining of tumor cells showing: (a) diffuse cytoplasmic positivity for chromogranin (40×); (b) strong membranous positivity for epithelial membrane antigen (40×); (c) negative for thyroid transcription factor 1 (100×); (d) negative for cytokeratin 20 (40×); (e) negative for tumor protein 63 (40×); and, (f) negative for smooth muscle actin (40×)