Figure 1

Representative magnetic resonance myelography (MRM) images of postpuncture cerebrospinal fluid (CSF) leakage. 2D MRM images were performed about 28 and 6 hours after the lumbar punctures in a 44-year-old male with chronic inflammatory demyelinating polyneuropathy (patient A) and a 42-year-old female with multiple sclerosis (patient B), respectively. Bilateral fluid collection around the nerve roots and paraspinal area (a, d) were depicted on 2D MRM images (arrows). Additionally, sagittal fat-suppressed T2-weighted (b) and axial T2-weighted (c) images of patient A revealed abnormal epidural and paraspinal fluid collections (arrowheads). In spite of such leakage, patient A was asymptomatic. However, patient B complained of an orthostatic headache that had persisted for six days. Arrowheads indicate fluid accumulation that was unrelated to CSF leakage (e.g., the bladder and ovarian cysts).