Rat bite erosions (gout)
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At the time the article was created Frank Gaillard had no recorded disclosures.View Frank Gaillard's current disclosures
At the time the article was last revised Daniel J Bell had no recorded disclosures.View Daniel J Bell's current disclosures
Rat (or mouse) bite erosions, also known as Martel sign or G sign, are seen in gout and refer to punched out erosions with sclerotic and overhanging margins.
History and etymology
This characteristic presence of the overhanging margin associated with the erosion in gout was first described by William Martel (1927–2014), an American radiologist, in 1968 3-5.
Punched out erosions are seen in several chronic erosive joint diseases, e.g. rheumatoid arthritis. However it is the presence of the overhanging margin displaced away from the cortex of the originating bone which is distinctive for gout and is only occasionally seen in other conditions such as rheumatoid arthritis 6.
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