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Washington University Experience | NEOPLASMS (NON-GLIAL NON-NEURONAL) | Choroid plexus papilloma | 16D2 Choroid plexus papilloma, atypical (Case 16) MIB 3

The tumor has an elevated proliferation index. (Ki67 IHC) ---- Immunohistochemistry (not shown): The tumor fails to stain with D2-40 (podoplanin). An immunostain for transthyretin is focally positive. ---- Comment: The presence of mitoses (>2/10 HPF) qualifies for a designation of an atypical choroid plexus papilloma (WHO grade II).

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