‘Dot in circle sign’: a characteristic finding in ultrasound and MR imaging of soft tissue mycetomas

Neelakantan, Sankar; Babu, Arul Arokia Sensan; Anandarajan, Rakesh

doi:10.1136/bcr-2016-216502

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…The main differential diagnoses include mycetoma, synovial sarcoma, and dermatofibrosarcoma protuberans. The "dot in a circle sign" refers to multiple conglomerate spherical lesions with hyperintense signal and hypointense rims, with a central hypointense dot on T2-weighted imaging, characteristic of mycetoma [8]. Although the lesion in the present case had multiple cystic components and thick, irregular septations, a central hypointense dot consistent with the "dot in a circle sign" was not observed on T2-weighted imaging.…”

Section: Discussionmentioning

confidence: 57%

Test yourself answer: exophytic slow-growing foot lesion

et al. 2022

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Section: Discussionmentioning

confidence: 57%

Test yourself answer: exophytic slow-growing foot lesion

et al. 2022

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“…The “dot‐in‐circle” sign can be seen with US. This is characterized by a hyperechoic central area (the dot) surrounded by hypoechoic tissue (the circle) . Doppler US has also shown advantages by demonstrating affected blood vessels and hyperemia .…”

Section: Discussionmentioning

confidence: 99%

“…This is characterized by a hyperechoic central area (the dot) surrounded by hypoechoic tissue (the circle). 20 Doppler US has also shown advantages by demonstrating affected blood vessels and hyperemia. 12 Even though it is possible to distinguish between actinomycetoma and eumycetoma, it can be difficult.…”

Section: Discussionmentioning

confidence: 99%

The importance of diagnostic imaging of mycetoma in the foot

et al. 2018

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Background Mycetoma is a chronic, localized infection caused by fungi and bacteria. It usually affects the skin, subcutaneous tissue, and bone of exposed areas with deformity of the affected limb, ulcers, and fistula; however, pain is not severe, therefore the patient comes late to hospital for care. Objective To establish the diagnosis of mycetoma in the foot by imaging and identify the principal radiological signs. Materials and Methods Six patients with foot mycetoma were evaluated with plain x‐ray, ultrasound, and magnetic resonance (MR) after confirming the diagnosis by histopathology and culture. Results All patients presented the MR “dot‐in‐circle” sign; four presented “punched out” bone lesions on plain x‐ray. The six patients had fistulas, ulceration, a seropurulent exudate, edema, and a foot deformity. Four patients had N. brasiliensis infection with positive anti‐Nocardia IgG antibodies, and only half presented bone lesions. Conclusion Characteristic findings were foot deformity, edema, bone lesions, ulcers, fistulas and the presence of the “dot‐in‐circle” sign. We recommend a comprehensive study of patients with plain x‐ray and MR.

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“…Ultrasound devices operating in the range of upper frequencies that goes from 15 to 22 MHz as well as MRI have reported the presence of hypoechoic or hypointense nodules with a "dot-incircle" sign, both in eumycetomas and actinomycetomas 6,7 . However, it would be difficult to discriminate between these entities only based on imaging 9 .…”

mentioning

confidence: 99%