Fig 2. Patient 4. Chronologic FLAIR and T1-weighted MR images of a 37-year-old woman with spontaneous intracranial hypotension. She had a 1-month history of orthostatic headache. Cervical epidural blood patch resolved the symptoms. A, Initial FLAIR image showing diffuse pachymeningeal hyperintensity at the falx, tentorium, and dura of the posterior fossa (arrowheads) and bilateral thick subdural effusion/hematomas (arrows). B, Second FLAIR image performed 1 month after effective blood patch showing disappearance of the diffuse pachymeningeal hyperintensity but thickening of the subdural effusion/hematomas (arrows). C, Follow-up FLAIR image showing remnant subdural effusion/hematomas (arrows). D, Initial T1-weighted image with gadolinium showing DPME at the falx, tentorium, and dura of the posterior fossa (arrowheads) and bilateral thick subdural effusion/hematomas (arrows). E, Second T1-weighted image taken 1 month after completely effective blood patch showing slight remnant of DPME and thickening of the subdural effusion/hematomas (arrows). F, Follow-up T1-weighted image showing remnant subdural effusion/hematomas (arrows).