Purpose:To evaluate brain MRI findings of spintaneous intracranial hypotension. Materials and Methods:A retrospective review of MRI finding was conducted on six patients with clinically proven spontaneous intracranial hypotension;no patient had a history of previous spinal pincture. Follow-up MRI was available in two patients, and to detect CSF leakage, radionuclide cisternography(n=5), myelography(n=1), and MR myelography(n=1) were performed. Results:On contrast-enhanced T1W1, diffuse dural enhancement was seen in all cases, subdural hematoma or hygroma was seem in four cases, pituitary gland prominence in four, dural sinus dilatation in four, downward displacement of the cerebellar tonsil in two, downward displacement of the iter in one, and suprasellar and prepontine cistern effacement in two. In no patient was abnormal CSF leakage found. Conclusion:Although dural enhancement, as seen on MRI, is not specific, diffuse enhancement of the dura mater accompanied by subdural hematoma, hygroma, pituitary gland prominence, dural sinus dilatation, downward displacement of the cerebellar tonsil, or suprasellar and prepontine cistern effacement can strongly suggest intracranial hypotension.