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Figure 2: (a) Immunohistochemical staining of paraganglioma showing synaptophysin positivity (IHC, ×100). (b) Tumor cells are immunonegative for thyroid transcription factor 1 immunohistochemical stain, but the adjacent thyroid follicles show nuclear positivity (IHC, ×100). (c) S100 immunohistochemical staining highlighting the sustentacular cells focally (IHC, ×400). (d) Ki-67 (IHC, ×100) showing a low proliferative index

Figure 2: (a) Immunohistochemical staining of paraganglioma showing synaptophysin positivity (IHC, ×100). (b) Tumor cells are immunonegative for thyroid transcription factor 1 immunohistochemical stain, but the adjacent thyroid follicles show nuclear positivity (IHC, ×100). (c) S100 immunohistochemical staining highlighting the sustentacular cells focally (IHC, ×400). (d) Ki-67 (IHC, ×100) showing a low proliferative index