From the case: Arachnoiditis

MRI
Axial T2
Modality: MRI (T2)

- “ MRI demonstrates characteristic appearances of arachnoiditis with an empty theca sign (cauda equina nerve roots are adherent to the margins of the...”

Used in the following articles:

  • Arachnoiditis - “ Arachnoiditis is a broad term encompassing inflammation of the meninges and subarachnoid space. Terminology Arachnoiditis affecting the cauda eq...”
  • Empty thecal sac sign - “ The empty thecal sac sign or empty sac sign is when the thecal sac appears empty on MRI of the lumbar spine, best seen on T2-weighted images. If t...”

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