What's Serum Manganese levels WRT Parkinsons

My neurologist was explaining that tests which showed a urine elevated manganese level was discovered, high enough to warrant a Serum Manganese test, but I don’t know enough about either of those things to ask intelligent questions. What is she talking about, what are the risks of elevated levels and will it complicate treatment of what she is currently diagnosing as Parkinsonian Plus Syndrome, or symptoms or whatever? I confess that once she pointed at the picture which showed no brain tumor, I lost focus for a little while.

Given all the standard doctor disclaimers, can y’all help me out a bit, here?

Thank you.