[Spontaneous intracranial hypotension: 12 case reports and follow-up]

Objective: To investigate the pathogenesis, clinical presentation, imaging features and prognosis of spontaneous intracranial hypotension. Methods: Clinical manifestation and imaging changes of 12 patients with spontaneous intracranial hypotension were reported. They were followed up regularly. The clinical and neuroimaging characteristics were summarized. Results: All the 12 cases were adults, presenting with orthostatic headache. They all recovered with conservative therapy. Head MRI demonstrated cerebral lobe hemorrhage, subdural hematoma, pituitary hyperemia, subarachnoid hemorrhage, enhancement of the pachymeninges, sagging of the brain, etc. Conclusions: Spontaneous intracranial hypotension is characterized by orthostatic headaches and is associated with compensatory changes following loss of CSF volume. The long-time prognosis is not bad.