Use of a Spin-Labeled Cerebrospinal Fluid Magnetic Resonance Imaging Technique to Demonstrate Successful Endoscopic Fenestration of an Enlarging Symptomatic Cavum Septi Pellucidi

Objective The aim of this study was to noninvasively visualize whether cerebrospinal fluid (CSF) compartments are in communication. Case Description An enlarging cavum septi pellucidi (CSP) produced progressive hydrocephalus following subarachnoid hemorrhage. We questioned what were the dynamics of CSF flow that led to enlargement of the CSP. Conclusion With this case report, we show the usefulness of a newly described magnetic resonance imaging time-spatial labeling inversion pulse technique to establish that an enlarging CSP was the cause of progressive hydrocephalus and that the hydrocephalus was successfully endoscopically treated when the CSP was fenestrated into the ventricular system, establishing communication between the two CSF compartments.