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 as a projection of the tumour indenting the pons 1,2.

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Article information

rID: 4613
Section: Signs
Synonyms or Alternate Spellings:
  • Thumb sign of chordoma
  • Thumbing of the pons (chordoma)

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Cases and figures

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    Figure 1: thumbing the pons sign
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    Case 1: on T1
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    Case 2: on T1
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