> This study suggests that the brain does not remove these built up paque over a 4 week period. What? It explicitly says that all of the tracer they used was c

> This study suggests that the brain does not remove these built up paque over a 4 week period. What? It explicitly says that all of the tracer they used was cleared after 4 weeks: "After 4 weeks, there were no differences in normalized T1 signal as compared to before intrathecal CSF tracer administration in any of the groups (Supplementary Table 4), i.e. no signs of remaining contrast agent in CSF or brain tissue in any of the groups."