Invasive carcinoma with neuroendocrine differentiation. Invasive carcinoma exhibiting morphological features similar to those of neuroendocrine tumors of the GI tract.
Neuroendocrine markers (like chromogranin) are expressed in a variable proportion of tumor cells. Histologically alveolar pattern of round solid nests of spindle-shaped carcinoma cells. Occasionally the tumor cells are polarized around pseudolumina.
Neuroendocrine tumor Sample 1
Neuroendocrine tumor Sample 2
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