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Testis : Carcinoid - Synaptophysin

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Testis_Teratoma_Carcinoid4_Synaptophysin.jpg

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As in other locations, well-differentiated neuroendocrine tumors (carcinoids) of the testis can be positive for synaptophysin (shown here), chromogranin, neuron-specific enolase, VIP, neurofilament protein, gastrin, as well as cytokeratin. They are negative for OCT3/4, CD30, c-kit, TTF-1, and CDX-2.

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