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Spindle cell carcinoid tumor of the thymus. (A) Low power view of a thymic spindle cell carcinoid tumor characterized by tumor cells arranged in a nested pattern (H&E, ×4); (B) the tumor cells have fusiform nuclei with a salt-and-pepper chromatin pattern and low to absent mitotic activity (H&E, ×20); the tumor cells show diffuse reactivity with neuroendocrine markers, including (C) synaptophysin (×10) and (D) chromogranin A (×10). H&E, hematoxylin and eosin.
