An Extremely Rare Case of Advanced Metastatic Small Cell Neuroendocrine Carcinoma of Sinonasal Tract

Figure 4

Pathology of the left nasal mass and bone marrow shows small cell undifferentiated (neuroendocrine) carcinoma. Light microscopy showed small round cells with scanty cytoplasm and hyperchromatic nuclei ((a) and (b)). Immunohistochemical staining showing tumor positivity for CD56 (c), chromogranin (d), and synaptophysin (e) (IHC ×100) and nuclear positivity to Ki-67 (f) (IHC ×100).

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