case_images: PMC8046466_01
case_images: Low-power (a) and high-power (b) histology slides demonstrating mononuclear polygonal chondroblasts in "cobblestone" pattern, and multinucleated giant cells, consistent with chondroblastoma.
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case_images: F1
case_images: Imaging revealed a bone lesion within the medial femoral condyle, and open biopsy revealed chondroblastoma (Fig. 1).
case_images: Arthroscopic images of working curette (A), working biter (B), tumor cavity after excision (C), and tumor cavity after grafting (D). These images were obtained via the single tunnel technique.
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case_images: F2
case_images: Arthroscopically assisted tumor excision was approached through a single, widened intraosseous tunnel, accommodating insertion of the arthroscope and instruments simultaneously (Fig. 2).
case_images: (A and B) Intraoperative arthroscopic image of PCL origin. (C) Histological confirmation of ligamentous tissue biopsied from site.
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case_images: F3
case_images: Interestingly, the posterior cruciate ligament (PCL) origin was able to be visualized from within the cavity and confirmed histologically (Fig. 3).
case_images: PMC8046466_02
case_images: Fluoroscopic image of two-tunnel technique being employed to curette lesion under arthroscopic assistance.
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case_images: F4
case_images: Surgery proceeded according to the two-portal technique, as described above (Fig. 4).
case_images: Arthroscopic image of curettage, performed via two-tunnel technique.
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case_images: F5
case_images: This two-tunnel technique provided minimal disruption to the physis, while facilitating "real-time" visualization of the excision (Fig. 5).
case_images: PMC8046466_03
case_images: Periarticular chondroblastoma of the right distal femur in a 15-year-old female.
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case_images: F6
case_images: X-ray and magnetic resonance imaging revealed a marrow replacing T2 hyperintense lesion abutting the articular cartilage of the lateral trochlea (Fig. 6).
case_images: Fluoroscopic image of curettage performed through lateral tunnel
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case_images: F7
case_images: Due to the distal and lateral nature of this tumor, a single-portal technique was utilized (Fig. 7).