Hughes Syndrome (HS) mimics MS

I've read on the MS Resource Centre site that a little known but easily treatable disease, Hughes Syndrome can mimic MS in various ways - one being on MRI scans where, and I quote: "White dots can show on an MRI with HS too. So it can be difficult to tell the difference between MS and HS from an MRI scan."
Please may a expert in this field shed some light?
Thanks.