Magnetic resonance images (sagittal view) of patients with downward displacement of the cerebellar tonsils and flattening of the pons, which are characteristic features of cerebrospinal fluid hypovolemia, called “brain sagging.” The results suggest that brain sagging due to CSF hypovolemia impairs vestibular and vestibulocerebellar functions, which may cause dizziness and vertigo ¹⁾.