"Summary: A new study in Nature Communications refutes long standing belief, reporting that cerebrospinal fluid exits the cranial cavity via lymph vessels."
"Past research has inadequately explained how cerebrospinal fluid exits the cranial cavity. Scientists knew that two paths were available – blood vessels (veins) and lymphatic vessels, but for a long time, and due due to insufficient research tools, they had assumed that drainage through the veins was by far the predominant pathway."
"The researchers led by Steven Proulx, Senior Scientist in Detmar’s group, have now been able to refute this assumption."
http://neurosciencenews.com/lymphatic-system-cranial-cavity-7912/

A new study in Nature Communications refutes long standing belief, reporting that cerebrospinal fluid exits the cranial cavity via lymph vessels.