Dot in a circle sign
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Citation:
Venkatesh M, Knipe H, Elfeky M, et al. Dot in a circle sign. Reference article, Radiopaedia.org (Accessed on 18 Feb 2025) https://doi.org/10.53347/rID-31431
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rID:
31431
Article created:
8 Oct 2014,
Manchikanti Venkatesh
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At the time the article was created Manchikanti Venkatesh had no recorded disclosures.
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Last revised:
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Micro-X Ltd, Shareholder (past)
These were assessed during peer review and were determined to not be relevant to the changes that were made.
View Henry Knipe's current disclosures
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10 times, by
8 contributors -
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The dot in a circle sign is an MRI finding for maduromycosis or mycetoma. It is described as a classic appearance on T2 weighted images, which show a small rounded hyperintensity (representing granulation tissue), surrounded by a low signal intensity rim (representing fibrous septa) with a hypointense dot (representing susceptibility loss due to fungi) in the center 1.
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References
- 1. Jain V, Makwana G, Bahri N, Mathur M. The "Dot in Circle" Sign on MRI in Maduramycosis: A Characteristic Finding. J Clin Imaging Sci. 2012;2:66. doi:10.4103/2156-7514.103056 - Pubmed
- 2. Kumar J, Kumar A, Sethy P, Gupta S. The Dot-In-Circle Sign of Mycetoma on MRI. Diagn Interv Radiol. 2007;13(4):193-5. - Pubmed
- 3. Cherian R, Betty M, Manipadam M et al. The “dot-In-Circle” Sign — a Characteristic MRI Finding in Mycetoma Foot: A Report of Three Cases. BJR. 2009;82(980):662-5. doi:10.1259/bjr/62386689 - Pubmed
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