MRI and Surgical Findings Refine Concepts of Type 2 Cerebrospinal Fluid Leaks in Spontaneous Intracranial Hypotension

Type 2 spinal cerebrospinal fluid leaks in patients with spontaneous intracranial hypotension occur after lateral dural tears through which the arachnoid herniates, which is visible on MRI scans (ie, the “bud-on-branch” sign).