case_images: PMC7183096_01
case_images: A radiograph (A) and MR images (B-D) at first presentation; B: T1-weighted axial image; C: STIR axial image; D: STIR coronal image. The tumor was located just underneath the joint cartilage (black arrows), and was surrounded by extensive oedema (*) and accompanied by hip joint effusion (white arrow).
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case_images: Radiographic studies revealed a well-defined osteolytic lesion of 2 cm in diameter in the femoral head with joint effusion and extensive oedema around the lesion (Fig. 1).
case_images: Paired registration using 10 points including the distal portion of the femur, surface marking of 36 points, and the results of registration.
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case_images: After paired registration and 36 surface markings, we were able to obtain accuracy of 0.7 mm (Fig. 2).
case_images: Intraoperative navigation monitor showing the shortest route to the tumor. The blue needle-like object represents the tracker, and the yellow line shows the distance to the tumor.
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case_images: The navigation system revealed that the tumor was accessible from anterior femoral neck with the left hip in 20 degrees of internal rotation (Fig. 3).
case_images: Hematoxylin and eosin staining of the curetted specimen.
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case_images: The pathologic diagnosis of the curetted specimen was chondroblastoma (Fig. 4).
case_images: A reconstructed CT image at two weeks post-surgery. Red arrows show the route taken to reach the tumor.
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case_images: CT images at two weeks after surgery showed that the route taken to the tumor was the shortest possible (Fig. 5).
case_images: A STIR MR image at 18 months after surgery (A) and a radiograph at 31 months after surgery (B).
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case_images: The latest radiograph showed bone regeneration in the defect after tumor removal (Fig. 6).