Hallervorden-Spatz Disease - HSD is a rare disorder characterized by progressive extrapyramidal dysfunction and dementia.
https://emedicine.medscape.com/article/1150519-overview?urlCache=aHR0cDovL2VtZWRpY2luZS5tZWRzY2FwZS5jb20vYXJ0aWNsZS8xMTUwNTE5LW92ZXJ2aWV3&cookieCheck=1
