Scalpel sign (spinal cord)

Scalpel sign

(spinal cord) • Dorsal thoracic arachnoid web - Ganzer Fall bei Radiopaedia

Tarasov, N. Dorsal thoracic arachnoid web. Case study, Radiopaedia.org. (accessed on 02 Nov 2022) https://doi.org/10.53347/rID-40760 • CC by-nc-sa 3.0 (modified)

Scalpel sign

(spinal cord) • Scalpel sign - Ganzer Fall bei Radiopaedia

Bickle, I. Scalpel sign. Case study, Radiopaedia.org. (accessed on 02 Nov 2022) https://doi.org/10.53347/rID-43436 • CC by-nc-sa 3.0 (modified)

Scalpel sign

(spinal cord) • Dorsal thoracic arachnoid web - Ganzer Fall bei Radiopaedia

Skalski, M. Dorsal thoracic arachnoid web. Case study, Radiopaedia.org. (accessed on 02 Nov 2022) https://doi.org/10.53347/rID-49276 • CC by-nc-sa 3.0 (modified)

Scalpel sign

(spinal cord) • Dorsal arachnoid web - scalpel sign - Ganzer Fall bei Radiopaedia

Goh, C. Dorsal arachnoid web - scalpel sign. Case study, Radiopaedia.org. (accessed on 02 Nov 2022) https://doi.org/10.53347/rID-34575 • CC by-nc-sa 3.0 (modified)

Scalpel sign

(spinal cord) • Dorsal thoracic arachnoid web - Ganzer Fall bei Radiopaedia

Harisis, G. Dorsal thoracic arachnoid web. Case study, Radiopaedia.org. (accessed on 02 Nov 2022) https://doi.org/10.53347/rID-58992 • CC by-nc-sa 3.0 (modified)

Scalpel sign

(spinal cord) • Dorsal thoracic arachnoid web - Ganzer Fall bei Radiopaedia

Kabra, U. Dorsal thoracic arachnoid web. Case study, Radiopaedia.org. (accessed on 02 Nov 2022) https://doi.org/10.53347/rID-72142 • CC by-nc-sa 3.0 (modified)

Scalpel sign

(spinal cord) • Dorsal thoracic arachnoid web (scalpel sign) - Ganzer Fall bei Radiopaedia

Bawazeer, A. Dorsal thoracic arachnoid web (scalpel sign). Case study, Radiopaedia.org. (accessed on 02 Nov 2022) https://doi.org/10.53347/rID-75334 • CC by-nc-sa 3.0 (modified)

Radiopaedia • CC-by-nc-sa 3.0 • de

The scalpel sign has been recently described in dorsal thoracic arachnoid web on sagittal MRI spine 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.