When should CT-guided blood patch be considered for patients with spontaneous intracranial hypotension headache?

First of all, I think the epidural blood patch for Spontaneous Intracranial Hypotension (SIH) should always be CT-guided and not XR-guided or "blind", whenever possible. And, while headache is present almost always, and the vast majority of the time the headache is orthostatic, the SIH syndrome is n...