Jan 6, 2022 · 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. 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.

Mar 15, 2025 · the typical appearance is the presence of well-defined “punched-out” erosions with sclerotic margins in a marginal and juxta-articular distribution, with overhanging edges, also known as rat bite erosions

Aug 1, 2023 · A radiograph demonstrated a punched-out erosion at the lateral femoral condyle with sclerotic margins, also known as a rat bite erosion or Martel sign (Figure). 2 The patient was diagnosed with gout and underwent intraarticular steroid injection for abortive therapy; because of lack of efficacy, this later transitioned to oral prednisone.

Jan 15, 2023 · These erosions have overhanging edges called rat bite erosions. There is preservation of joint spaces. Periarticular hyperdense soft tissue swelling due to tophi as a result of crystal depositions (pathognomonic). These are located in …

Apr 23, 2023 · Erosive arthritis has a broad differential: symmetrical involvement of the proximal interphalangeal joints, metacarpophalangeal joints, and carpal bones. osteopenia and then osteoporosis, uniform joint space loss, subchondral cyst …

4 days ago · There are characteristic erosions with "overhanging" edges seen in gout (white arrows). These have been characterized as appearing like "rat-bites."

They form punched out erosions with overlying sclerotic margins. These are the common “rat-bite ” erosions, also known as Martel sign, which are classically seen on certain sites such as MTP joints but can be seen on PIP and DIP joints as in our patient.

These are the common “rat-bite” erosions, also known as Martel sign, which are classically seen on certain sites such as MTP joints but can be seen on PIP and DIP joints as in our patient. These classic signs can assist clinicians in making a confident diagnosis of acute gouty arthritis by X …

There are large tophaceous deposits (white arrows) surrounding several of the joints of the right hand. There are juxta-articular, punched-out lytic erosions (white and yellow circles) and a lack of osteoporosis characteristic of gout. The erosions are shown in close-up view (blue arrows).

J Rheumatol. 2023 Aug;50 (8):1087. doi: 10.3899/jrheum.221171. Epub 2023 Feb 15. 2 Division of Rheumatology, Department of Medicine, University of Toronto, and Division of Rheumatology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.