Scalpel sign (spinal cord)

The scalpel sign has been recently described in dorsal thoracic arachnoid web on sagittal MRI studies. It relates to focal distortion of the thoracic cord, appearing anteriorly displaced. The enlarged dorsal CSF space mimics the profile of a surgical scalpel.

It is helpful in distinguishing cases where the thoracic cord is focally anteriorly displaced, a finding seen in a couple of other conditions in addition to dorsal thoracic arachnoid web, namely ventral cord herniation and the presence of a dorsal arachnoid cyst.


Inspired signs
Share article

Article Information

rID: 30903
Section: Signs
Tags: refs, cases
Synonyms or Alternate Spellings:
  • Scalpel sign of dorsal thoracic arachnoid web

Support Radiopaedia and see fewer ads

Cases and Figures

  • Drag
    Figure 1: a scalpel
    Drag here to reorder.
  • Drag
    Dorsal thoracic arachnoid web
    Drag here to reorder.
  • Drag
    Case 1
    Drag here to reorder.
  • Updating… Please wait.
    Loadinganimation

    Alert accept

    Error Unable to process the form. Check for errors and try again.

    Alert accept Thank you for updating your details.