case_images: PMC6276445_01
case_images: (a, b) A radiograph shows an epiphyseal osteolytic lesion in the end of the right femur (arrow).
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case_images: PMC6276445_01_CRIOR2018-8030862.001.jpg
case_images: fig1
case_images: An anteroposterior plain radiograph revealed the osteolytic lesion surrounding by the bone sclerotic lesion in the lateral femoral condyle (Figures 1(a) and 1(b)).
case_images: Coronal T1-weighted MR image shows a low-signal-intensity lesion (arrow).
case_images: CRIOR2018-8030862.002.jpg
case_images: PMC6276445_01_CRIOR2018-8030862.002.jpg
case_images: fig2
case_images: T1-weighted (T1W) and T2-weighted (T2W) images (Figure 2). The orthopedic physician made a diagnosis of osteochondritis dissecans.
case_images: (a) Coronal T1-weighted MR image reveals the lesion growing larger. (b, c) Sagittal T1 and T2-weighted images show a low-signal-intensity lesion (arrow).
case_images: CRIOR2018-8030862.003.jpg
case_images: PMC6276445_01_CRIOR2018-8030862.003.jpg
case_images: fig3
case_images: After 13 months, the patient underwent MRI of the knee once more, which demonstrated that the osteolytic lesion grew larger and now measured 16 mm x 10 mm x 10 mm (Figures 3(a)-3(c)).
case_images: Arthroscopy showed the depressed lesion like a dimple at the lateral condyle of the femur.
case_images: CRIOR2018-8030862.004.jpg
case_images: PMC6276445_01_CRIOR2018-8030862.004.jpg
case_images: fig4
case_images: Arthroscopy revealed a depressed lesion, such as the dimple at the lateral condyle of the femur (Figure 4).
case_images: After the curettage of the tumor, the tumor was completely resected and the subchondral bone appeared to be intact.
case_images: CRIOR2018-8030862.005.jpg
case_images: PMC6276445_01_CRIOR2018-8030862.005.jpg
case_images: fig5
case_images: We performed biopsy, and the tumor was removed completely with the sharp curettes and suction during arthroscopy (Figure 5).
case_images: The tumor tissue was macroscopically gray-white and contains yellow brown foci.
case_images: CRIOR2018-8030862.006.jpg
case_images: PMC6276445_01_CRIOR2018-8030862.006.jpg
case_images: fig6
case_images: The tumor tissue was macroscopically gray-white and contained yellow brown foci (Figure 6).
case_images: (a) Hematoxylin-eosin staining showed a storiform pattern with giant cells. (b) The tumor did not show nuclear Histone 3.3 G34W immunoreactivity.
case_images: CRIOR2018-8030862.007.jpg
case_images: PMC6276445_01_CRIOR2018-8030862.007.jpg
case_images: fig7
case_images: The histological specimen showed a storiform pattern with giant cells (Figure 7(a)). The tumor did not show nuclear Histone 3.3 G34W immunoreactivity (Figure 7(b)).
case_images: (a) Coronal computed tomography image shows a bone cavity lesion one month after the surgery. (b) Coronal computed tomography image shows the tumor bone cavity filled with bone formation one year after the surgery.
case_images: CRIOR2018-8030862.008.jpg
case_images: PMC6276445_01_CRIOR2018-8030862.008.jpg
case_images: fig8
case_images: Computed tomography revealed that the previous tumor bone cavity was filled with bone formation and no evidence of recurrence (Figure 8).