On the discovery of lymphatic vessels in the brain:

“Scientists claim to have made a stunning discovery about the brain that ‘overturns decades of textbook teaching’ – and paves the way for a new generation of treatments for conditions such as dementia and autism. 

They have discovered a ‘missing link’ between the brain and the immune system – and that the two are directly connected by vessels previously thought not to exist.”

Read more: http://www.dailymail.co.uk/health/article-3112055/Landmark-discovery-brain-scientists-rewriting-textbooks-help-treat-conditions-autism-Alzheimer-s.html