case_images: PMC11079585_01
case_images: A radiograph of the right knee of a 17-year-old boy showing no detectable abnormalities.
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case_images: C-reactive protein level of 67.3 mg/L. Chest and knee radiographs were normal ( Figures 1 and 2).
case_images: A chest radiograph of a 17-year-old boy showing no detectable abnormalities.
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case_images: C-reactive protein level of 67.3 mg/L. Chest and knee radiographs were normal ( Figures 1 and 2).
case_images: Utrasonography of the right knee reveals an echogenic collection of the right popliteal fossa.
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case_images: Doppler ultrasound of the lower limb showed a collection of the right popliteal fossa with an echogenic content, a clean wall independent of the popliteal pedicle, and thrombophlebitis of the right saphenous vein ( Figure 3).
case_images: T1-weighted MRI reveals a vascularized mass adjacent to the semimembranosus and medial gastrocnemius muscles.
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case_images: This aspect suggested an infectious etiology ( Figure 4).
case_images: Microscopy shows an inflammatory granulation tissue with acellular eosinophil deposits and epithelioid cells.
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case_images: Histopathological examination revealed the presence of inflammatory granulation tissue with acellular eosinophil deposits and epithelioid cells, suggesting a tuberculous origin ( Figure 5).
case_images: A control MRI demonstrated complete disappearance of the previously described mass with no joint effusion.
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case_images: MRI was performed in the eighth week of treatment that demonstrated complete disappearance of the previously described mass in the popliteal fossa, with no joint effusion or synovial thickening. Muscular and fatty edema had disappeared, and the bone signal was normal ( Figure 6).
case_images: A clinical photograph of the knee showing a posterior scar with disappearance of the swelling.
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case_images: f7