Thumb sign (chordoma)

A.Prof Frank Gaillard et al.

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 tumor 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

  • 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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