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Free Content Know Your Notochord: A Pictorial Review of Notochord Remnants

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Notochord formation begins between the third and fourth weeks of embryonic development. As the axial skeleton develops, the notochord regresses and eventually contributes to the formation of the nucleus pulposus of the intervertebral disks. Notochord regression can be variable, especially at the 2 poles of the skeleton, which results in the persistence of ectopic notochordal remnants. These remnants include benign entities (eg, ecchordosis physaliphora, benign notochordal cell tumor, Tornwaldt cyst, canalis basilaris medianus, fossa navicularis) or malignant lesions (eg, chordoma). We present a review of these lesions, their clinical presentations, and their typical radiographic appearances. Notochord remnants may have overlapping features in terms of their location and appearance; however, differentiation is crucial because the proper treatment and management may differ drastically. Familiarity with notochord development aids in understanding the characteristic locations of notochordal remnants. Noting the unique imaging findings of notochordal remnants can often help narrow the differential diagnoses.

Learning Objective: To describe notochord development, normal regression during fetal life, and notochord remnants that give rise to anatomic variants, including benign and malignant lesions.
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Document Type: Research Article

Publication date: February 1, 2020

More about this publication?
  • Neurographics is the peer-reviewed, bimonthly educational journal of the American Society of Neuroradiology. The journal comprises articles selected from material presented at the ASNR Annual Meeting. Neurographics also publishes other high-quality submissions that are primarily educational and have a high emphasis on a pictorial approach. Neurographics offers CME credit for reading review articles and completing quiz-based self-assessment activities.

    Visit asnr.mycrowdwisdom.com to view all available CME courses.

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