Dot in a circle sign

Last revised by Henry Knipe on 13 Feb 2025

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.

Cases and figures

  • Case 1
  • Case 2: actinomycosis (Madura foot)
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