Testis : Carcinoid - Synaptophysin
Section Editor: Dharam M. Ramnani, MD
Virginia Urology, Richmond, VA, USA
Image Description
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.