Claw sign (mass)
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At the time the article was created Frank Gaillard had no recorded disclosures.
View Frank Gaillard's current disclosuresAt the time the article was last revised Maulik S Patel had no financial relationships to ineligible companies to disclose.
View Maulik S Patel's current disclosures- Claw-sign
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:
Quiz questions
Question 1431
A 4-year-old-boy presents with a painless right-sided abdominal mass. He is otherwise well. On ultrasound examination, there is an 8.2 cm diameter heterogeneous mass, with a ‘claw sign’ demonstrated in relation to the upper pole of the kidney. The lesion contains a number of cystic areas and a few small areas of calcification. What is the most likely diagnosis?
References
- 1. Routhier JR, Woodfield CA, Mayo-smith WW. AJR teaching file: fat-containing retroperitoneal mass presenting with acute flank pain. AJR Am J Roentgenol. 2009;192 (6): S122-4. doi:10.2214/AJR.07.7007 - Pubmed citation
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