case_images: PMC9856175_01
case_images: Anteroposterior and lateral radiographs of the left knee showing a patchy high-density shadow of the left distal femur without fracture or bone destruction.
case_images: fsurg-09-1009975-g001.jpg
case_images: PMC9856175_01_fsurg-09-1009975-g001.jpg
case_images: F1
case_images: Anteroposterior and lateral radiographs of the left knee showed a patchy high-density shadow of the left distal femur without fracture or bone destruction (Figure 1).
case_images: Representative coronal (Figure 2A) and axial (Figure 2B) T1-weighted images showing an isolated patchy abnormal signal of the left distal femur, with low signal intensity. Representative coronal (Figure 2C) and axial (Figure 2D) T2-weighted images showing a heterogenous lesion of the left distal femur with high signal intensity, with uneven internal signal, and no clear abnormal signal in the muscle and subcutaneous soft tissue of the left thigh.
case_images: fsurg-09-1009975-g002.jpg
case_images: PMC9856175_01_fsurg-09-1009975-g002.jpg
case_images: F2
case_images: MRI of the left thigh showed an isolated patchy abnormal signal of the left distal femur, with low signal intensity on T1-weighted images (Figures 2A,B), as well as a heterogeneous lesion of the left distal femur with high signal intensity on T2-weighted images (Figures 2C,D), with uneven internal signal, and no clear abnormal signal in the muscle and subcutaneous soft tissue of the left thigh.
case_images: Histopathological examination of the specimens revealed that a pile of yellow broken bone tissues were visible to the naked eye.
case_images: fsurg-09-1009975-g003.jpg
case_images: PMC9856175_01_fsurg-09-1009975-g003.jpg
case_images: F3
case_images: Histopathological examination of the specimens revealed that a pile of yellow broken bone tissues were visible to the naked eye, with a total volume of 4 cm*3 cm*1 cm (Figure 3).
case_images: In some typical microscopic images, myxoid degeneration, calcified bone tissue, fat necrosis, cystic degeneration, irregular calcification, and collagen degeneration of fibrous tissue are seen (original magnifications of x4 in (A,B, x10 in (C), x40 in D).
case_images: fsurg-09-1009975-g004.jpg
case_images: PMC9856175_01_fsurg-09-1009975-g004.jpg
case_images: F4
case_images: And in some typical microscopic images, myxoid degeneration, calcified bone tissue, fat necrosis, cystic degeneration, irregular calcification, and collagen degeneration of fibrous tissue are seen (Figure 4).
case_images: Anteroposterior and lateral radiographs of the left femur showing no abnormal signal at the left distal femur on the 3rd day after the surgery.
case_images: fsurg-09-1009975-g005.jpg
case_images: PMC9856175_01_fsurg-09-1009975-g005.jpg
case_images: F5
case_images: Anteroposterior and lateral radiographs of the left femur showed no aberrant signal at the left distal femur on the 3rd day after the surgery (Figure 5).
case_images: Follow-up anteroposterior and lateral radiographs of the left knee 6 months after the surgery showing good recovery of the left distal femur, consistent with postoperative changes of the left distal femur.
case_images: fsurg-09-1009975-g006.jpg
case_images: PMC9856175_01_fsurg-09-1009975-g006.jpg
case_images: F6
case_images: Six months later, anteroposterior and lateral radiographs of the left knee showed good recovery of the left distal femur, consistent with the postoperative change of the left distal femur (Figure 6).