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Metabolic imaging. APTw MRI of brain protein concentration. There is moderately increased APTw signal in choroid plexus papilloma and markedly increased signal in choroid plexus carcinoma (pink arrows) compared to the rest of the brain. Normal choroid plexus and CSF in the subarachnoid spaces contain low amounts of protein. Courtesy of Yun Peng, PhD. APTw, amide proton transfer weighted; CSF, cerebrospinal fluid.
