The neurosurgical guidelines recommend low invasive intracranial pressure (ICP) monitoring with infusion tests to detect CSF dynamics alteration. In this study, we investigate how PC-MRI could be helpful in intracranial flow investigations. Eighty-three patients suspected of active hydrocephalus underwent the conventional ICP investigations. All the patients had also the day before, a rapid and simple PC-MRI to assess their cerebral blood and CSF flows. We found that patients who presented altered CSF dynamics (observed by ICP monitoring) presented also the smallest cervical CSF oscillations in the population. PC-MRI brings easy, quick and non-invasive complementary information to investigate the craniospinal dynamic.