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Washington University Experience | NEOPLASMS (NON-GLIAL NON-NEURONAL) | Choroid plexus papilloma | 5C2 Choroid Plexus Papilloma (Case 5) S100 1.jpg
Higher magnification image of #5C1 (S100 IHC) ---- Immunohistochemistry (not shown): The tumor is strongly and diffusely positive for vimentin. A large subset of the tumor is strongly positive for CAM5.2. The proliferation marker Ki67 stains a very low number of tumor cells (less than 1%). The tumor is negative for glial fibrillary acidic protein (GFAP), pan-cytokeratin AE1/AE3 (CK), cytokeratin 20 (CK20), and D2-40 (podoplanin).
