Welcome to NeuroTalk.
I'd suggest you visit our myasthenia gravis forum anyway.
There are patients there who are seronegative for antibodies.
The ptosis and thymus tumor, are typical signs of it.
From what I have read over there thru the years, MG can be
misdiagnosed.
http://neurotalk.psychcentral.com/forum77.html
It is possible also, to have more than one thing going on.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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