From the case: Chordoma: thumb sign

Modality: MRI
Sagittal T1
Modality: MRI (T1)

- “ The thumb sign is relatively specific for clival chordomas. ”

Used in the following articles:

  • Chordoma - “ Chordomas are uncommon malignant tumours that account for 1% of intracranial tumours and 4% of all primary bone tumours.  They originate from emb...”
  • Thumb sign (chordoma) - “ The thumb sign or thumbing of the pons is described in chordomas as is meant to be relatively specific. It is seen in midline sagittal projection ...”
  • Bone tumours - “ There are a bewildering number of bone tumours with a wide variety of radiological appearances: bone-forming tumours osteoid osteoma osteoblast...”

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