Idiopathic intracranial hypotension (hypovolemia) is almost exclusively provoked by cerebrospinal fluid (CSF) leakage through spontaneously rent dural sac. An initial clinical feature of a severe headache with or without nausea/vomiting should be differentiated from a life-threatening stroke. An early diagnosis and proper therapy may guarantee a good outcome, while delays may promote complicated manifestations and irreversible poor outcome in a few patients. In this article, neuro-imaging studies of some demonstrable cases are presented and the outlets of the spinal CSF and spinal CSF pathways are shown with immunohistological staining.