Dot in a circle sign
Mycetoma
foot. Main hypointense lesion of soft tissues of the second finger. No intralesional Doppler signal.
Mycetoma
foot. Numerous small lesions of low intensity in T1 (left image). After contrast (right image) we can see those numerous enhancing lesions containing small low-foci. The lesions are separated by tissue of low signal intensity.
Mycetoma
foot. Multiple lesions with faint central foci of low signal intensity tissue.
Mycetoma
foot. Hypointense mass with small nodular hyperintense lesions surrounding the second finger of the left foot.
Dot in a circle sign is an MRI sign 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 .
Siehe auch:
Assoziationen und Differentialdiagnosen zu Dot in a circle sign:
