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Int J Dermatol ; 58(5): 600-604, 2019 May.
Article in English | MEDLINE | ID: mdl-30565209

ABSTRACT

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.


Subject(s)
Foot Diseases/diagnostic imaging , Mycetoma/diagnostic imaging , Adolescent , Adult , Aged , Female , Foot Diseases/diagnosis , Foot Diseases/microbiology , Humans , Male , Middle Aged , Mycetoma/diagnosis , Mycetoma/microbiology
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