Despite prior assumptions that the brain is devoid of lymphatic vessels, emerging evidence indicates that lymphatic vessels are present in the region alongside the superior sagittal sinus, the parasagittal dural (PSD) space, and could play a critical role in waste clearance or glymphatic physiology. However, limited methods are available for interrogating this space non-invasively in vivo. Here, in 62 healthy participants we apply novel deep learning algorithms in sequence with anatomical and phase contrast cerebrospinal fluid (CSF) flow assessments to test fundamental hypotheses regarding how PSD volume evolves across the lifespan and relates to measures of CSF flux and volume.
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