I've been hoping medical kiwis would chime in on this, thanks.
As
@glass_houses said, Null had a source who said in July that Yaniv has an issue with his filtering organs that allows excess fluid to build up in his skull (
7/3/19 stream around the 55-min. mark;
KF post, 7/2/19 refers to it but contains slight wording error).
In June, Yaniv went to the ER on one occasion and walked out without learning anything because he saw the words "brain," "leaking," and "stint" (
stent or
shunt?) somewhere and got scared (
KF post, 6/16/19) - this was in the same week he hinted he had a brain tumor, then said he didn't, but later said he did.
A medical historian here has since raised doubts about hydrocephalus being Yaniv's Dx (KF post
8, 7/24/19).
Can you say more about what you observe in that scan?