Claw sign (mass)

Last revised by Maulik S Patel on 20 Oct 2024

The claw sign is useful in determining that a mass arises from a solid structure rather than is located adjacent to it and distorts the outline.

It refers to the sharp angles on either side of the mass, which the surrounding normal parenchyma forms when the mass has arisen from the parenchyma. As such, normal parenchyma extends some way around the mass.

Examples where a claw sign is useful include:

Cases and figures

  • Case 1: Wilms tumour
  • Case 2: Wilms tumour
  • Case 3: Wilms tumour
  • Case 4: Wilms tumour
  • Case 5: Wilms tumour
  • Case 6: Wilms tumour
  • Case 7: Rathke's cleft cyst
  • Case 8: lipoma - biceps brachii muscle
  • Case 9: hepatic adenoma
  • Case 10: Wilms tumour
  • Case 11: intramuscular lipoma
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