Choroid Plexus Papilloma

            Choroid plexus papillomas are rare tumors that arise from cells of the choroid plexus. Their histologic picture is strikingly similar to normal choroid plexus. These lesions are benign and expand within a ventricle, eventually leading to obstruction of CSF pathways. Moreover, they may be associated with increased CSF production, another factor contributing to hydrocephalus.

Choroid plexus papillomas usually have well-defined margins, with parts of the tumor outlined by CSF. On T2-weighted scans they are only mildly hyperintense because their T2 relaxation times are not as prolonged as in parenchymal tumors. They are relatively homogeneous, but hypervascularity can result in areas of flow void or flow enhancement. Choroid plexus papillomas demonstrate intense homogeneous contrast enhancement. Endnote  

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