PMC7607935_01
(a) Sagittal and (b) axial computed tomography images of left ankle showing central calcification within a radiolucent lesion of talar neck. (c) T1- and (d) T2-weighted sagittal magnetic resonance imaging showing a bone lesion in talar neck with surrounding bone marrow edema and synovitis in front of bone lesion.
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F1
Computed tomography (CT) scans demonstrated a focal nidus at the lateral distal part of the talar neck (Figure 1a, b). Magnetic resonance imaging (MRI) views showed reactive bone edema in the talar head and neck areas, supportive of the diagnosis of OO (Figure 1c, d).
(a) Arthroscopy of left ankle joint. Hyperplasia with hyperemia of joint synovium was noted. (b) After synovectomy, a red subperiosteal lesion was seen through thinned cortex of talar neck.
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F2
The lesion appeared as an elevated hyperemic bony protuberance with adjacent synovitis (Figure 2).
(a) After curettage of subperiosteal lesion, a red subperiosteal lesion was seen through reactive hyperemic bony of talar neck. (b) Reactive hyperemic bony columns were completely cleared using a motorized burr.
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F3
The nidus of the OO and circumferential sclerotic bone was curetted (Figure 3).
Postoperative axial and sagittal computed tomography images showing base after removal of lesion.
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F4
Figure 4 shows postoperative sagittal and axial CT images of base after removal of the lesion.