Cerebrospinal Fluid Leaks are something that can completely mimic a large amount of FTD symptoms, and even in the care of utmost professionals, can be near undetectable - and somehow, treatment can be as beautifully simple as a one and done injection... to a hellish guessing game and years of attempts. As Dr. Ian Carrol of Stanford's research has indicated, they seem to be highly misdiagnosed/undiagnosed as well.
I know HN has had posts about CSF Leaks before. I truly believe they're one of the worst things we face in this age that can actually be treated with 100% recovery in some cases. However, for far too many, that really means nothing as they'll be sent to a psych facility, nursing home, or become homeless, and die as a whithered husk of what was once a human before they have the slightest indication of what is actually wrong with them, let alone make their way to one of the few places that truly treat the condition.