What is the logic behind making this the title when presumably the majority of the techy crowd on hn would not be able to understand what it means or even why it's important?
Personally, I found the title to be immediately understandable. I'm at techie but have had health issues where I believe poor brain CSF drainage has been a factor.
"Nasopharyngeal" can be a tricky word but "naso-" is a prefix that predictably means "nose", which lets you guess the rest.
The lymphatic system is quite important as your body's second circulatory system, but it's unfortunately not mentioned much in school here. Hopefully doctors are taught more about its importance.