case_images: PMC8046471_01
case_images: (a and b) X-ray showing radiolucent lesion over epiphysis of the distal end of femur.
case_images: JOCR-11-67-g001.jpg
case_images: PMC8046471_01_JOCR-11-67-g001.jpg
case_images: F1
case_images: The radiographs revealed an ovoid radiolucent lesion with sclerotic margins over posterolateral aspect of epiphysis in distal end of the left femur with epiphyseal breach and transphyseal extension (Fig. 1).
case_images: (a and b) Magnetic resonance imaging showing hyperintense lesion over distal femoral epiphysis extending into physis and metaphysis.
case_images: JOCR-11-67-g002.jpg
case_images: PMC8046471_01_JOCR-11-67-g002.jpg
case_images: F2
case_images: The lesion is fairly centrally located within epiphysis (more to the lateral half), superiorly transphyseal extension into metaphysis, and inferiorly thinning of cortex with the focal cortical breach (Fig. 2).
case_images: (a) High power showing chondroblastoma cells surrounded by chicken wire type of calcification. (b) Low power showing scattered osteoclasts, focal cartilage, and calcification.
case_images: JOCR-11-67-g003.jpg
case_images: PMC8046471_01_JOCR-11-67-g003.jpg
case_images: F3
case_images: Interspersed in between is multinucleated osteoclastic types of giant cells and also seen are foci of chondroid areas with eosinophilic matrix and foci showing characteristic deposits of chicken wire type of calcification (Fig. 3a and b).
case_images: Intraoperative picture showing cartilage thinning and intercondylar breach of the tumor.
case_images: JOCR-11-67-g004.jpg
case_images: PMC8046471_01_JOCR-11-67-g004.jpg
case_images: F4
case_images: Intraoperative picture presented as a breach through intercondylar fossa with thinning of cartilage (Fig. 4).
case_images: (a and b) Cartilage window elevation, curettage, and closure.
case_images: JOCR-11-67-g005.jpg
case_images: PMC8046471_01_JOCR-11-67-g005.jpg
case_images: F5
case_images: Since the cartilage window had adequate cover, we do not experience any spillage of graft and cartilage window was closed and sutured (Fig. 5).
case_images: (a and b) Immediate post-operative X-ray showing entire removal of lesion and the cavity filled with bone graft.
case_images: JOCR-11-67-g006.jpg
case_images: PMC8046471_01_JOCR-11-67-g006.jpg
case_images: F6
case_images: (a and b) One-year follow-up X ray showing graft incorporation and remodeling with no signs of recurrence.
case_images: JOCR-11-67-g007.jpg
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case_images: F7
case_images: No radiological sign of recurrence was found at 1-year follow-up (Fig. 7).