Of note, these images were obtained 30 minutes after a contrast-enhanced MRI brain.
An extensive extradural fluid collection involving the entire spinal canal partially effaces the thecal sac. Posteriorly at C1-C2 fluid is also seen in the soft tissues (C1-C2 false localizing sign).
The collection is T2 and T1 hyperintense to CSF and contains multiple engorged epidural veins. The signal hyperintensity may be due to proteinaceous content or due to contrast accumulation.